Bombe Nélusko

Ingredients

Equipment Needed

• •1.5-liter (6-cup) smooth metal bombe mould or stainless-steel bowl, about 18 cm (7 inches) wide
• •Countertop ice-cream machine
• •Food processor
• •Electric hand mixer or stand mixer
• •Instant-read or sugar thermometer
• •Small heavy saucepan
• •Fine-mesh sieve
• •Silicone spatula and small offset spatula

Instructions

1. 1

   Chill mould and tools

   Clear a level space in a freezer set to at least -18°C (0°F). Chill the empty 1.5-liter metal mould, the offset spatula, and a sturdy spoon for at least 1 hour. Metal takes the cold quickly and releases cleanly later; glass insulates too well and risks cracking during unmoulding.

   A deep stainless-steel mixing bowl is the honest home equivalent of a bombe mould. Choose one with a smooth interior and a rounded base, not a flat-bottomed bowl with seams.
2. 2

   Make hazelnut pralin

   Toast the hazelnuts at 175°C (350°F) for 8 to 10 minutes, until golden at their centres and deeply fragrant. Arrange them close together on a silicone mat or lightly oiled baking sheet. Combine the ½ cup sugar and 2 tablespoons water in a small heavy saucepan, bring to a boil, and stop stirring once it bubbles. Cook to a deep amber, then pour it over the nuts and leave it untouched until hard and cold. If the syrup crystallizes before it colours, add a tablespoon of water, cover for 1 minute, and dissolve it gently before continuing. Ça se rattrape. Break the caramel into pieces and process until it passes from crumbs to a glossy paste, pausing to scrape the bowl and protect the motor. This is pralin, caramelized nuts ground until their own oil binds them.

3. 3

   Cook the pralined ice

   Warm the milk and ¾ cup cream until small bubbles gather at the edge. Whisk the 3 yolks with the 2 tablespoons sugar, then pour in half the hot dairy in a slow stream while whisking. Return everything to the saucepan and stir constantly over medium-low heat until the crème anglaise coats the spoon and reaches 82 to 84°C (180 to 183°F). Remove it immediately, then blend in all the hazelnut pralin and the salt until smooth. If the first fine grains of yolk appear, set the pan in ice water, blend at once, and strain. Ça se rattrape at that stage; firmly scrambled custard does not.

4. 4

   Chill and churn

   Strain the pralined custard into a bowl set over ice water and stir until thoroughly cold. Cover and refrigerate for 2 hours, or until no warmer than 4°C (40°F). Churn in a countertop ice-cream machine until it holds soft folds and heaps from the paddle, usually 20 to 25 minutes. Use it at once for the lining; freezing it solid first turns a simple spreading job into masonry.

5. 5

   Chemiser the cold mould

   The source points to Another Method of Preparing Aspics de Filets de Soles (No. 916) for the handling principle it calls clothing the mould: building an even layer against a thoroughly chilled form. Spoon the soft pralined ice into the cold mould and press it over the base and sides in an even layer about 1.5 cm (⅝ inch) thick, leaving the centre hollow. Work from the bottom upward and inspect for thin spots. If the coating slides or pools, freeze it for 15 minutes, add a second thin coat, and continue. Freeze the completed shell for 60 to 90 minutes, until a fingertip leaves no mark. Any pralined ice left after patching can be frozen separately.

   The aspic itself never enters Bombe Nélusko. Only the mould-lining technique crosses the reference, translated from liquid jelly set over broken ice to soft pralined ice pressed against a frozen metal bowl.
6. 6

   Ready chocolate and cream

   Melt the dark chocolate in a dry bowl set over barely simmering water, removing it when a few pieces remain and stirring until smooth. Hold it near 38 to 40°C (100 to 104°F); hot chocolate collapses the filling, while cold chocolate sets into flecks. In a separate chilled bowl, whip the 1¼ cups cream to soft, drooping peaks and return it to the refrigerator.

7. 7

   Beat the pâte à bombe

   Combine the ½ cup sugar and 2 tablespoons water in a clean saucepan and cook without stirring. When the syrup reaches 110°C (230°F), begin beating the 5 yolks at medium speed. At 118°C (244°F), remove the syrup from the heat and pour it in a thin stream down the inside of the mixer bowl, never directly onto the moving whisk. Beat at high speed until the pâte à bombe is thick, pale, and falls in a broad ribbon, about 6 to 8 minutes; the bowl should feel barely warm, around 32 to 35°C (90 to 95°F). If the syrup crystallizes in its pan, add a tablespoon of water and redissolve it over low heat before returning to temperature.

   Hot sugar burns fiercely. Keep the bowl steady, pour down its side, and leave any hardened threads stuck above the mixture rather than scraping them into the smooth yolks.
8. 8

   Fold and fill

   Whisk one-third of the pâte à bombe firmly into the melted chocolate to make a glossy emulsion, then whisk in the remainder. The first addition may tighten abruptly. If it becomes grainy, set the bowl over barely warm water for 5 seconds and whisk until smooth, then remove it at once. Fold in one-third of the whipped cream to lighten the mixture, then fold in the rest with broad turns until no white streaks remain. The filling should be cool and softly mounded. Spoon it into the frozen pralined shell, pressing gently into the curve so no air pockets remain, and level it flush with the rim. Freeze uncovered for 30 minutes, then cover tightly and freeze for at least 6 hours, preferably overnight.

9. 9

   Freeze and unmould

   Chill the serving platter. Remove the bombe from the freezer and wrap the outside of the mould in a warm, damp towel for 10 seconds. Invert it onto the platter and lift steadily. If it refuses, repeat with the towel for 5 seconds; don't plunge the mould into hot water, which melts the pralined shell before the centre releases. Let the unmoulded Bombe Nélusko stand for 8 minutes, then cut it with a knife dipped in hot water and wiped completely dry between slices. The tawny shell should hold a clean ring around the dark chocolate heart. À table!

Chef Tips

• •Use a dark chocolate you would happily eat by itself, between 66 and 70 percent cocoa. Cold flattens sweetness and exposes waxy fat, weak roasting, and cheap cocoa with perfect clarity.
• •A purchased hazelnut praline paste may replace the homemade pralin if its ingredients are roughly equal parts roasted hazelnuts and caramelized sugar. Use about ¾ cup (180 ml / 200 g). Chocolate-hazelnut spread is not pralin and makes a soft, over-sweet shell.
• •Without an ice-cream machine, freeze the cold pralined custard in a shallow metal pan and beat it vigorously every 30 minutes for four or five rounds. The texture will be a little coarser, but it will still line the mould honestly.
• •For pregnant, elderly, or immunocompromised guests, use pasteurized egg yolks. The hot syrup heats the yolks, but a home mixer doesn't provide a measured pasteurization hold.
• •Serve small, clean wedges with coffee or a modest glass of Banyuls or Maury. The bombe needs no sauce, fruit, piped cream, or decorative commotion.

Advance Preparation

• •The hazelnut pralin can be made up to 1 week ahead and refrigerated airtight. Let it soften at room temperature before blending it into the custard.
• •The pralined ice shell can be churned, moulded, and frozen a day before the chocolate filling is made. Wrap the mould once the surface is hard so it doesn't take on freezer aromas.
• •The completed Bombe Nélusko is best frozen overnight and keeps well for 3 days, tightly covered. Unmould only when the table is ready, then give it 8 minutes to temper before slicing.

Frequently Asked Questions

Nutrition Information

1 serving (about 170g)