IICCT Chocolate Taster cheat sheet

Three cultivated groups are recognised: Criollo (aromatic, low bitterness, disease-susceptible), Forastero (Amelonado-type, robust, higher astringency, bulk cocoa) and Trinitario (Criollo × Forastero hybrid, fine flavour with vigour).

Theobroma cacao is a cauliflorous evergreen tree of the Malvaceae family; pods grow directly from the trunk and older branches, and each pod holds 30–50 seeds embedded in sweet mucilaginous pulp.

Genetic reality: 'variety' names are mostly population labels, not pure cultivars. Modern genotyping recognises 10 genetic clusters; Nacional (Ecuador) and Criollo are the classic fine-flavour references.

Two seed cotyledon colour types occur: white/pale cotyledons (Criollo-like, often lower tannin) and purple cotyledons (anthocyanin-rich, typical of Forastero).

Origin centre is the Upper Amazon basin; domestication spread through Mesoamerica. The Criollo cacao of Central America is genetically distinct from Amazonian Forastero.

Cocoa swollen shoot virus (CSSVD), frosty pod (Moniliophthora roreri) and witches' broom (M. perniciosa) are the key production-limiting diseases; black pod (Phytophthora) is globally important.

Flavour potential is set by genotype: fine-flavour cacao typically has higher levels of fruity/floral volatiles and lower astringency precursors, but processing can destroy or reveal it.

Nacional cacao from Ecuador has a distinctive 'Arriba' flavour profile associated with specific aroma compounds; bulk Nacional is increasingly blended with CCN-51, a high-yield clonal hybrid.

Pod maturity is judged by colour change, stem drying and a hollow sound; harvest interval is typically every 2–4 weeks, and over-ripe pods reduce flavour quality and increase disease risk.

Fermentation is a microbial succession: yeasts (anaerobic, produce ethanol) → lactic acid bacteria → acetic acid bacteria (aerobic, oxidise ethanol to acetic acid, raising temperature to 45–50 °C).

Fermentation duration is typically 4–7 days for bulk cacao; fine-flavour origins often use shorter or controlled fermentations (e.g. 3–5 days) to preserve fruit and floral notes.

Key fermentation variables: mass size (typically 100–1000 kg), turning frequency, aeration, temperature and duration. Under-fermentation leaves purple cotyledons and astringency; over-fermentation gives hammy, putrid or mouldy notes.

Drying must reduce moisture from about 60% to 7–8% for safe storage; sun drying is preferred for flavour, but slow drying risks mould (including ochratoxin A producers).

Properly fermented beans have a brown, fissured cotyledon and a clean, fruity or chocolate aroma; slaty, purple cotyledons indicate under-fermentation.

Post-harvest quality defects include smoky taint (from drying over wood fires), mould, insect damage, and contamination from poor storage; these are graded using cut tests and sensory panels.

Drying rate matters: rapid artificial drying can cause case-hardening and off-flavours; slow, even drying preserves acidity balance and reduces astringency.

Roasting develops flavour via Maillard reactions and Strecker degradation; typical whole-bean roast temperatures are 120–150 °C for 20–45 minutes, with lower temperatures and longer times for fine-flavour beans.

Winnowing removes the shell after cracking; nib yield is typically 80–88% of bean weight, and residual shell content should be below about 1.5% in the nib.

Refining reduces particle size to below 20–25 µm so the chocolate feels smooth on the tongue; a typical target is 15–20 µm.

Conching reduces moisture, volatile acidity and astringency, and develops viscosity and flavour rounding; durations range from several hours (milk chocolate) to 72 hours or more (dark).

Tempering produces stable Form V (β) crystals of cocoa butter; the classic curve is melt to 45–50 °C, cool to 27–28 °C, then reheat to 31–32 °C for dark and 29–30 °C for milk/white.

Poor temper shows as fat bloom (grey streaks), poor snap, or dull surface; temper is verified by a temper meter or by a test on a cold surface.

Chocolate viscosity and yield value are measured with a rotational viscometer and controlled by lecithin and cocoa butter content; over-refining increases viscosity and requires more fat.

EU rules: 'chocolate' must contain at least 35% total dry cocoa solids, of which at least 18% cocoa butter and at least 14% dry non-fat cocoa solids; milk chocolate requires at least 25% total dry cocoa solids and 14% milk solids.

US standards differ: dark chocolate requires at least 35% chocolate liquor; milk chocolate at least 10% chocolate liquor and 12% milk solids.

Permitted ingredients include sugar, cocoa butter, cocoa mass, milk powder, emulsifiers (lecithin E322, PGPR E476) and flavourings (vanillin or vanilla). Vegetable fats other than cocoa butter are permitted up to 5% in some jurisdictions but must be labelled.

White chocolate contains no cocoa solids: it requires cocoa butter (at least 20% in the EU), milk solids and sugar.

Labelling requires ingredient lists in descending order of weight, allergen declaration (milk, nuts, soy), and percentage cocoa declarations; 'single origin' and 'bean-to-bar' claims are not legally defined in all markets.

Sugar-free and 'no added sugar' chocolates use polyols (maltitol, erythritol) or fibres; they can cause laxative effects and have different tempering behaviour.

Cocoa butter equivalents (CBE), replacers (CBR) and substitutes (CBS) differ in compatibility; only CBE is fully compatible with cocoa butter tempering, and CBS requires different processing.

Organic, Fairtrade and Rainforest Alliance certifications are separate schemes with distinct standards; a product can carry multiple marks, and none of them guarantees fine flavour.

Controlled conditions: neutral temperature (around 20–22 °C), low odour environment, blind coding, and palate cleansers (water, plain crackers, green apple) between samples.

Descriptive analysis uses trained panels and a defined lexicon; hedonic testing uses untrained consumers and measures liking, not intensity.

Tasting sequence: assess appearance, snap, aroma (before and after breaking), melt, flavour, texture and aftertaste; record intensity and quality separately.

Use standard scales (e.g. 0–15 intensity) and reference standards to anchor attributes; avoid leading questions and record only what is perceived.

Discrimination tests (triangle, duo-trio) determine whether samples differ significantly; they are not suitable for describing how they differ.

Tasting vocabulary should be precise: 'fruity', 'floral', 'nutty', 'spicy', 'earthy', 'smoky' are aroma families; 'astringent', 'bitter', 'sour' are taste/tactile attributes.

Sample preparation matters: uniform piece size, consistent temperature, and blind coding reduce bias; tasters should avoid coffee, spicy food and smoking before a session.

Statistical significance in sensory panels depends on panel size and training; small panels give indicative, not definitive, results.

Positive aroma families: fruity (red fruit, citrus, tropical), floral, nutty, caramel, spicy, woody, earthy, dairy and honey notes; these are described by intensity and persistence.

Defect descriptors include smoky, hammy, putrid, mouldy, musty, chemical/solvent, over-fermented, under-fermented (astringent, green) and 'barnyard'.

Bitterness and astringency come from alkaloids (theobromine, caffeine) and polyphenols; they increase with under-fermentation and over-roasting.

Acidity should be balanced; sharp acetic or lactic notes indicate over-fermentation or poor drying, while fresh fruity acidity can be a positive trait in fine cacao.

Fat bloom is a whitish surface layer caused by cocoa butter recrystallisation; sugar bloom is a rough, sandy surface caused by moisture.

Mouldy or musty taints may indicate ochratoxin A risk; smoky taint is associated with direct wood-fire drying.

Aroma lexicon should be used consistently across a panel; terms should be defined with reference standards (e.g. specific fruits, nuts, spices).

Aftertaste and length are quality indicators: fine chocolate typically has a long, clean finish, while defective samples leave lingering off-notes.

Dark chocolate typically contains 50–100% cocoa solids; higher percentages are more bitter and astringent, but not necessarily higher quality.

Milk chocolate balances cocoa, milk and sugar; white chocolate contains cocoa butter but no cocoa solids.

Single-origin chocolate highlights a specific region or farm; single-estate is more specific, and 'bean-to-bar' indicates the maker controls processing from bean to finished bar.

Craft chocolate often uses small-batch roasting, longer conching and higher cocoa percentages; industrial chocolate prioritises consistency and cost.

Regional flavour profiles: Ecuadorian Nacional (floral, fruity), Venezuelan Criollo (nutty, fruity), Madagascar (red fruit, citrus), Ghana/ Ivory Coast (classic cocoa, nutty).

Product categories include bars, couverture (high cocoa butter for coating), ganache, pralines, truffles, drinking chocolate and cocoa powder.

Couverture must have high cocoa butter content (typically 32–39%) for fluidity and gloss in moulding and enrobing.

Origin labelling is not a guarantee of quality; vintage, fermentation and maker skill also determine flavour.

Ideal storage: 15–18 °C, relative humidity below 50–55%, away from light and strong odours; chocolate absorbs odours readily.

Fat bloom occurs when cocoa butter melts and recrystallises at the surface, often due to temperature fluctuations; it is a cosmetic defect, not a safety issue.

Sugar bloom occurs when moisture dissolves surface sugar which recrystallises on drying; it produces a rough, grainy texture.

Shelf life for dark chocolate is typically 12–24 months; milk and white chocolate have shorter shelf lives (6–12 months) due to milk fat oxidation.

Moisture uptake can cause sugar bloom and mould; packaging should be moisture- and odour-barrier (e.g. foil, metallised film).

Off-flavours from storage include rancidity (from nut or milk fat oxidation), cardboard/musty notes from packaging, and absorption of cleaning chemicals.

Chocolate should not be refrigerated for long periods; condensation on removal encourages sugar bloom.

Quality defects can be assessed by appearance, snap, aroma and texture; a trained panel distinguishes bloom from mould and from fat or sugar migration.

Certification schemes: Fairtrade (minimum price and premium), Rainforest Alliance (environmental and social criteria), Organic (EU/ USDA), and UTZ (now merged into Rainforest Alliance).

Traceability requires lot-level records from farm to bar; blockchain and digital passports are increasingly used, but data quality varies.

Child labour and deforestation are key risks; the Cocoa and Forests Initiative and national traceability systems (e.g. Ghana, Côte d'Ivoire) aim to address them.

Living income for farmers is a central issue; farm-gate prices are often below living income benchmarks, and premiums from certification do not always reach farmers.

Fine flavour cacao is a small share of global production (often cited as 5–10%), and premiums reward quality but require consistent post-harvest practices.

Direct trade models shorten the supply chain and improve farmer relationships, but require investment in fermentation, drying and quality control.

Deforestation-free sourcing is increasingly demanded by EU regulation (EUDR) requiring geolocation of plots and due diligence.

Sustainability claims should be specific and verifiable; vague terms like 'ethical' or 'sustainable' are not legally defined and risk greenwashing.

Use a consistent tasting protocol: code samples, record appearance, aroma, flavour, texture, aftertaste and overall quality on a structured form.

Calibrate vocabulary with reference standards and a shared lexicon; avoid vague terms like 'nice' or 'bad' in favour of specific descriptors.

Report intensity and quality separately; a strong but unpleasant note is different from a subtle pleasant one.

Blind tasting reduces bias; reveal origin and maker only after scoring to avoid expectation effects.

Communicate results with evidence: specific descriptors, intensity ratings and comparison to reference samples.

Professional tasting requires neutral environment, no strong perfumes, and palate cleansing between samples.

Statistical literacy matters: know when a difference is meaningful versus noise, and report panel size and method.

Ethical communication avoids overclaiming health benefits or origin authenticity without evidence.