Black Sesame Ice Cream — intensely nutty Japanese sesame gelato

i. Origin & history

Black sesame — kurogoma — has a long history in Japanese cooking, used whole, toasted, ground into surigoma and made into the paste neri goma. It appears in goma dofu, in dressings, in wagashi and scattered over rice. The ingredient is thoroughly domestic, and its move into ice cream is a natural extension rather than a novelty.

The flavour became widely established as Japan's Western-style dessert repertoire developed through the twentieth century, and it now sits alongside matcha, hojicha and red bean as one of the defining Japanese ice cream flavours. It is also common in Chinese and Korean dessert contexts, where black sesame has similarly deep roots — Chinese tangyuan filled with black sesame paste is a direct relative in flavour terms.

Internationally it has become one of the more visible Japanese-origin dessert flavours, partly because of its striking appearance. The grey colour is genuinely unusual in a dessert case and does a lot of the marketing work.

Black sesame is worth distinguishing from white. The two are the same plant but different varieties, and black sesame retains its hull, which carries much of the flavour and all of the colour. Black sesame is more bitter, more intensely aromatic and less sweet than white, and tahini — made from hulled white sesame — is not a substitute in any meaningful sense.

ii. Toasting, grinding, and the smoothness problem

Two steps determine whether black sesame ice cream tastes like anything: how the seeds are toasted, and how finely they are ground.

Toasting is essential and is where the flavour comes from. Raw sesame is flat and faintly grassy; toasted sesame is nutty, deep and aromatic, because heat drives Maillard reactions and releases the volatile compounds that make sesame taste like sesame. Toast the seeds in a dry pan over medium heat, moving them constantly, until they smell strongly nutty and begin to pop — usually three to five minutes. Black seeds cannot be judged by colour, which is the difficulty: you must go by smell and sound. They burn quickly and burnt sesame is acridly bitter, so the pan should come off the heat the moment the aroma peaks.

Grinding is the second problem. Sesame seeds are small and hard, and inadequately ground seeds give a gritty ice cream — the most common flaw in home versions. A suribachi, the ridged Japanese mortar, is the traditional tool and works very well. A small spice grinder or a high-powered blender will do it, and grinding while the seeds are still warm helps considerably, since the oils release more readily. Grind until the mixture goes from powder to a slightly oily paste; that transition is the point at which it will disperse properly into a custard.

You can also buy neri goma, black sesame paste, ready-made, which is what many Japanese recipes assume and which removes both problems. It is worth checking whether the version you buy is sweetened.

The base itself is a standard custard, cooked to around 82 °C. Sesame is a strong flavour but freezing mutes everything, so the base should taste slightly too strong at room temperature. Keep the sugar restrained: the appeal of this flavour is its bitterness and savouriness, and an over-sweet base flattens exactly what makes it interesting.

iii. Ingredients

Makes 8 servings · scroll the side panel to adjust

• 100 g black sesame seeds
• 400 ml whole milk
• 300 ml double cream
• 120 g caster sugar
• 5 egg yolks
• 1 pinch salt
• 1 tbsp black sesame paste (optional, for intensity)

Black sesame seeds (kurogoma), not white — the hull carries the colour and much of the flavour, and tahini made from hulled white sesame is not a substitute. Ready-made neri goma black sesame paste is a legitimate shortcut; check whether it is sweetened. Egg yolks give the smooth, rich base that suits this flavour. Use whole milk and double cream. Keep the sugar moderate — the bitterness is the point. A good pinch of salt is more important here than in most ice creams and sharpens the sesame considerably. A small spoonful of glucose improves the texture at home.

iv. Method

1. Toast black sesame seeds in a dry pan over medium heat until they crackle and smell intensely nutty (3-4 minutes). Cool slightly, then grind to a fine paste in a food processor or grinder — about 5 minutes.
2. Warm milk, cream, and half the sugar to just-simmering.
3. Whisk yolks with remaining sugar until pale. Temper with warm dairy, then cook over low heat to 82 °C, stirring constantly.
4. Whisk the sesame paste (and extra paste if using) into the hot custard. Strain. Chill 4 hours.
5. Churn until thick. Freeze 3 hours to firm.

v. Tips & common mistakes

• Toast the seeds by smell and sound, not colour. Black seeds give no visual cue. Toast in a dry pan over medium heat, moving constantly, until they smell strongly nutty and start to pop — three to five minutes. Take the pan off at the peak of the aroma; burnt sesame is acridly bitter and unusable.
• Grind while still warm, and grind past powder. Warm seeds release their oils more readily. Keep going until the powder turns into a slightly oily paste — that transition is what lets it disperse into the custard instead of sitting in it as grit.
• Strain the base, then strain it again. Through a fine sieve, twice if you can. Any remaining seed fragments will be very noticeable in the finished ice cream, and they are easy to miss until it has frozen.
• Make the base taste too strong. Freezing mutes flavour substantially. A base correctly balanced at room temperature will taste weak once frozen, so push the sesame further than seems right.
• Keep the sugar down and the salt up. The bitterness and savouriness are the appeal. Over-sweetening buries them, and a good pinch of salt does more for this flavour than for almost any other ice cream.
• Chill the base overnight before churning. A properly cold base churns faster and forms smaller ice crystals. It also lets the sesame flavour develop and deepen, which it noticeably does over several hours.

vi. Variations

Black sesame and matcha is a classic pairing, either swirled or served as two scoops. Black sesame with honey softens the bitterness. Black sesame and kinako leans further into the toasted register. A vegan version made with coconut milk works unusually well, since coconut and sesame are a natural match. Related desserts include Chinese tangyuan filled with black sesame paste, hojicha ice cream as a companion flavour, and black sesame mochi ice cream.

vii. Serving & storage

Black sesame ice cream is served in scoops and takes well to Japanese accompaniments — a spoonful of anko, a drizzle of kuromitsu, a few toasted whole sesame seeds scattered over, or a warm dorayaki underneath. It also works surprisingly well against fruit, particularly stone fruit. Let it soften for five to ten minutes before serving; the flavour is deep but the aromatics are volatile and are largely lost at full freezer temperature.

It keeps for up to two months in an airtight container in the freezer with cling film pressed onto the surface, though the toasted aroma is at its best in the first few weeks and fades slowly thereafter. Sesame oil can pick up freezer odours, so keep it well sealed and away from anything strongly flavoured. Never refreeze it once it has melted — the emulsion breaks and the texture turns grainy in a way that resting will not repair.

ix. More from Japanese

• Hojicha Ice Cream — roasted-tea ice cream
• Frozen Custard — Midwest soft-serve
• Monaka — wafer ice-cream sandwich
• Mochi Ice Cream — ice cream in mochi
• Pistachio Gelato — intense pistachio gelato
• Bastani — Persian saffron ice cream