Hazelnuts for chocolate production: a manufacturer’s guide
Hazelnuts can be a visible inclusion, a praline base, a paste, a coating component or a flavour-defining ingredient. Each use creates different requirements for roast, size, skin, texture, testing and process control.
1. Match the format to the chocolate product
Whole or half kernels suit tablets, dragées and premium inclusions where appearance matters. Chopped hazelnuts support toppings, inclusions and layered products. Paste is used in pralines, spreads and fillings, while flour can contribute flavour and solids where a fine distribution is required.
Choose format after defining whether the hazelnut remains visible, passes through pumps or depositors, receives further refining, or must deliver a particular bite.
2. Control roast as a sensory specification
Roasting develops characteristic aroma, reduces raw notes and changes colour and moisture. “Light”, “medium” and “dark” are useful briefing terms but not complete specifications because equipment, time and temperature produce different results. Approve a representative sample and describe the target colour, aroma, flavour intensity and absence of burnt or rancid notes.
If chocolate processing adds further heat, evaluate the hazelnut in the finished recipe rather than in isolation.
3. Decide how much skin is acceptable
Natural kernels retain the skin; blanching uses heat to loosen and remove much of it. Residual skin affects appearance, bitterness perception and colour speckling. For pale fillings or smooth pralines, a buyer may prefer a tighter residual-skin target. For darker recipes, the visual effect may matter less.
State the acceptable residual skin and approve it visually under consistent lighting.
4. Specify size for line performance
Whole-kernel calibre matters when the nut remains visible or must fit a mould. Chopped material needs particle-size distribution and limits on fines because excessive fines can alter texture, fat release and dust. Paste requires a texture or particle-size expectation compatible with refining and mouthfeel.
Confirm that pieces will pass through hoppers, screws, nozzles and depositors without bridging or blockage.
5. Manage oxidation and shelf life
Hazelnuts contain unsaturated fats and their sensory quality can deteriorate through oxidation. Roast level, particle size, oxygen exposure, temperature, light and time all influence stability. Chopped and milled formats have more exposed surface than whole kernels.
Agree packaging, storage conditions, production date or lot reference and shelf-life basis. Validate the ingredient in the finished chocolate system, whose fat phase and packaging also influence sensory life.
6. Build food-safety and allergen controls
Hazelnut is a named allergen under EU Regulation 1169/2011. Manufacturers must manage identification, segregation, cleaning, changeover and label information within their own system. Supplier documents should support traceability and correct product identity.
Aflatoxin controls require appropriate prevention, sampling and analysis. EU Regulation 2023/915 sets different categories according to intended treatment or final use. Codex CXC 59-2005 describes preventive practices across production, handling, storage and processing.
7. Approve against measurable and sensory criteria
A useful chocolate-manufacturing specification combines measurable parameters with an approved sensory reference. Define product, processing, calibre or particles, colour, roast, residual skin, moisture target, defect tolerances, foreign matter, analytical requirements, packaging and lot coding.
Run a line trial when flow, dosing, coating adhesion, refining or finished-product texture could be affected.
Frequently asked questions
Are roasted hazelnuts always preferable for chocolate?
No. Roasted hazelnuts deliver developed flavour, but manufacturers with their own roasting process may prefer natural kernels for greater control.
Why specify fines in chopped hazelnuts?
Fines can change texture, dust levels, fat release and dosing behaviour, so the full particle distribution matters.
Should paste be approved only by particle size?
No. Particle size is useful, but roast, flavour, viscosity or flow, separation behaviour and finished-product performance should also be evaluated.