Hazelnut Cacao: Roasting, Skinning, and the Morning Cup
In 1806 Napoleon's continental blockade cut off British shipping to Europe, and cocoa became scarce and expensive in Turin. The confectioners there did what confectioners do and stretched what they had with what they could get locally, which was hazelnuts from the Langhe hills. The result was gianduja, and two centuries later the hazelnut-and-cacao combination is so established that most people assume it was always obvious.
It was an economy measure that turned out to be better than the original. This is how to do it properly at home, starting from whole nuts.
Why hazelnut and cacao fit together so well
Both are fermented or cured, then roasted, and roasting is where most of the flavour in each is created rather than revealed. The browning reactions that run during roasting generate overlapping families of aromatic compounds in both — nutty, toasty pyrazines in particular. They are not two flavours meeting; they are two flavours that already share vocabulary.
The textural argument is just as strong. Hazelnuts are roughly 60 percent fat, and hazelnut fat is soft, low-melting, and mostly oleic acid. Cocoa butter is harder and melts sharply just below body temperature. Combine them and you get a fat blend that is smoother and slower-melting than either alone, which is precisely the mouthfeel gianduja is famous for.
Salt completes it. A small amount of salt suppresses bitterness and pushes both the nut and the cacao forward. Gianduja without salt tastes flat in a way that is hard to diagnose until you add some.
Buying hazelnuts
The Piedmont variety, Tonda Gentile, holds a protected geographical indication as Nocciola Piemonte, and it is the benchmark — round, thin-skinned, and intensely aromatic. Turkish hazelnuts make up the large majority of world production and are perfectly good, generally a little milder. Oregon grows excellent nuts too.
Buy them in the shell if you can be bothered, or whole and unroasted if not. Two things to avoid: pre-chopped nuts, which have far more cut surface exposed to air and go stale quickly, and pre-roasted nuts of unknown age.
Hazelnut oil is highly unsaturated and oxidises readily. Rancid hazelnut has a distinctive smell — old paint, crayon, stale oil — and once you have identified it you will notice it in a lot of commercial products. Smell the nuts before you commit. Store them in the freezer if you are keeping them more than a month.
Roasting and skinning
This is the step that makes the difference, and it takes fifteen minutes.
Spread the nuts in a single layer and roast at 150°C for 12 to 15 minutes. You are looking for the interior to go from white to pale gold — break one open at 12 minutes to check. Lower and slower is better than hot and fast, which browns the outside while the middle is still raw.
The skins are bitter and tannic and you want them off. Roasting is what loosens them. Tip the hot nuts into a clean tea towel, wrap them up, and rub firmly for thirty seconds. Most of the skins will come away. You will not get every last one and you do not need to — around 80 percent removed is fine.
If a batch refuses to give up its skins, it is under-roasted. Put it back for three more minutes.
The alternative method is blanching: boil the nuts for three minutes in water with a couple of tablespoons of bicarbonate of soda, which turns the water black and slips the skins off completely. It works beautifully and it also waterlogs the nuts, so you then have to dry and roast them anyway. Use it only if you need perfectly clean nuts for appearance.
Making hazelnut butter
Once roasted and skinned, hazelnuts turn to butter in a food processor with no additions at all. The only thing you need is patience.
Process warm nuts — they release oil faster. The sequence goes: coarse crumbs, then fine powder, then a thick stiff paste that climbs the sides, then, quite suddenly, a smooth pourable butter. Total time is eight to twelve minutes depending on the machine.
The mistake is stopping at the stiff paste stage, which is where most people give up and add oil. Do not add oil. Scrape the sides down, keep going, and it will break. Adding oil at that point gives you a permanently loose, greasy butter.
Add salt at the very end — about 1 g per 200 g of nuts — and pulse it through.
Making hazelnut milk
For a morning drink, milk is often better than butter because it gives you the flavour without the density.
Soak 100 g of raw hazelnuts overnight in cold water. Drain, rinse, and blend with 500 ml of fresh water for ninety seconds — a 1:5 ratio, which gives a milk with real body. Strain through a nut milk bag or a double layer of muslin, squeezing firmly.
Two notes. Use raw nuts for milk rather than roasted: roasted nuts make a milk that tastes wonderful and separates almost immediately, because roasting damages the proteins that keep the emulsion stable. And keep the leftover pulp — dried in a low oven it becomes hazelnut meal for baking.
Homemade nut milk separates in the fridge within a day. That is normal and it is a sign there is nothing in it holding it together. Shake it.
The morning cup
- Heat 240 ml of hazelnut milk to 75°C. Steaming, not boiling — boiling nut milk makes it grainy.
- Whisk 14 g of ground ceremonial cacao into a couple of tablespoons of it first, to a smooth paste.
- Combine, and whisk in a teaspoon of hazelnut butter for richness.
- Add a pinch of flaky sea salt, crushed between your fingers.
- Whisk hard for a minute, or plunge in a French press to build foam.
Fourteen grams sits in the range we suggest for a daily cup, at 10 to 15 g. If you want it richer, add hazelnut butter rather than more cacao — past about 18 g the cup starts to feel heavy for the morning.
Sea salt, and using it properly
Salt in a drink like this does two jobs and the type matters for one of them.
Dissolved into the liquid, salt suppresses bitterness and makes the whole cup taste rounder. For that, any salt works — fine sea salt dissolves fastest.
Sprinkled on top as a flake, it does something different. Flaky salt like Maldon has thin, hollow crystals that sit on the surface and dissolve unevenly, producing intermittent bright bursts of salinity against the fat. That contrast is a large part of what makes salted chocolate work, and it disappears entirely if you stir it in.
So use both: a pinch dissolved during the whisk, and a few flakes crushed over the foam at the end. If you only do one, do the dissolved one — it is the more important of the two.
Making it ahead
Hazelnut butter keeps for a month in a sealed jar at room temperature and longer refrigerated, though it stiffens when cold. Roasted skinned nuts keep about two weeks before the flavour dulls noticeably. Hazelnut milk lasts three days refrigerated.
A reasonable Sunday routine is to roast 300 g of nuts, turn half into butter and leave half whole, then make milk twice during the week from a separate bag of raw nuts. That gives you a properly good morning cup on a weekday in about four minutes.
For the cacao itself, the pure ground is the one to use here — the hazelnut is doing the flavouring and you want the cacao underneath it to be unadorned. If you would rather have something already rich and lightly sweetened to sit against the nuts, the Maple Sweetened blend at 70 percent cacao works well without needing any additional sugar.
