Tiramisu Gelato

What lands first is bitter coffee and cocoa, then sweet cream, with softened biscuit thickening the body and an egg-rich weight that stays put.

It is the mascarpone and the coffee that make this a Veneto dessert rather than a coffee gelato with biscuit stirred through. Both go in as themselves: mascarpone at 120 g/kg and 44% fat, which supplies most of the fat in the tub on its own, and concentrated espresso at 60 g/kg instead of instant coffee, because the soluble version brings bitterness without the roasted volatiles that make the flavour recognisable. Egg yolk enters at half the dose a custard base would take, enough to emulsify and to leave the zabaione memory, and the mascarpone never goes above 60 C so it cannot split.

Egg yolk sits at 40 g, about half what a crema would take. In tiramisu the yolk is a binder and a memory of zabaione, not the lead, and 40 g give enough lecithin to emulsify the mascarpone fat without pushing protein, which closes at 4.51 percent against a 5 ceiling.

The coffee is 60 g of concentrated espresso rather than instant, because instant delivers the bitterness without the roasted volatiles, and those 60 g bring only about 54 g of water, which the base absorbs. The 35 g of ladyfinger biscuit dissolved into the mix supply the starch and the vanilla and egg note the palate reads as savoiardo, plus around 9.1 g of sugar. Cocoa powder appears at just 6 g: it is the dusting on top of the dessert, and any more shifts the flavour to chocolate and buries the coffee.

Because the fixed ingredients already deliver a large share of the fat and the milk solids, the milk lines are what the solver used to steer the rest: 350 g of whole milk plus 189 g of skim, which lets water land at 61.97 percent in a 58 to 66 band and MSNF at 8.58 percent without adding another gram of fat.

Ingredients

Makes 1000 g of finished base.

Method

Custard to 85 C, mascarpone folded in at 60 C, tray with three passes

1. 1Whisk every dry ingredient together first: sugars, milk powder, stabiliser and salt. Dry-blending them stops the stabiliser clumping when it meets liquid.
2. 2Warm the liquids to 40 C (104 F), then rain the dry mix in while whisking hard.
3. 3Beat the yolks with part of the sugar, then temper: pour the warm base over the yolks in a thin stream, never the other way round.
4. 4Bring to 82 to 85 C (180 to 185 F) and stop. Past 87 C the yolk coagulates and no amount of blending brings the flavour back.
5. 5Chill in an ice bath to under 5 C (41 F) within 2 hours. Slow cooling is where bacteria and coarse crystals both start.
6. 6Age 6 to 12 hours in the fridge under 5 C (41 F). This is when the stabiliser and the milk protein take up water.
7. 7Freeze in a shallow metal pan 2 to 3 cm deep, breaking the crystals with a fork every 30 to 40 minutes, 4 to 6 times.
8. 8Freeze firm, then temper 10 to 15 minutes in the fridge before scooping.

The balance

All six against the professional range for Milk Gelato.

Fat at 8.31 percent against a 5 to 12 band is what fixes the mascarpone dose. At 44 percent fat, 120 g of mascarpone bring roughly 52.8 g of the total, so there is no cream in the sheet and no room for a full crema dose of yolk. Protein at 4.51 percent against a 3 to 5 band is the other constraint: yolk, milk powder and skim milk all push it, which is why the yolk stops at 40 g. MSNF closes at 8.58 percent just above its 8 floor, solids at 38.03 against 34 to 42, sugars at 17.56 against 14 to 22, POD at 168.95 against 135 to 200, PAC at 258.33 against 220 to 300 and water at 61.97 against 58 to 66. Lactose is 4.68 percent of the mix and 7.55 percent of the water, and the sandiness check passes.

If it goes wrong

Allergens: egg, milk

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