Preparation for Iced Fruit Mousses

Ingredients

Equipment Needed

• •Digital scale accurate to 1 g
• •Small 1-quart (1-liter) saucepan
• •Fine-mesh sieve
• •Large chilled mixing bowl
• •Electric hand mixer or stand mixer with whisk
• •Broad flexible spatula
• •Six 4-ounce (120 ml) metal or silicone molds
• •Small freezer-safe tray

Instructions

1. 1

   Make the cold syrup

   Set six 120 ml freezer-safe molds on a tray, then chill the mixing bowl and beaters. Put the granulated sugar and water in a small saucepan and warm them gently, stirring only until every crystal disappears. Remove the pan as soon as the syrup is clear; a prolonged boil would evaporate water and disturb its density. Transfer every drop to a bowl on the scale. The batch should weigh 200 g, so if evaporation has taken it below that, stir in cold water gram by gram until it returns to 200 g. Cool completely, then refrigerate for at least 30 minutes and weigh out exactly 150 g. This syrup is approximately 35° Baumé when cold, meaning about 65% sugar by weight.

   The 35° describes syrup density, not temperature. A digital scale replaces the pastry kitchen's hydrometer honestly and with far less ceremony.
2. 2

   Chill the fruit base

   Weigh 150 g of strained fruit purée into the 150 g of cold syrup and whisk until completely uniform. If you are working with raspberries, blackcurrants, strawberries, apricots, or peaches, pass the purée through a fine sieve before weighing; the ratio is based on usable purée, not seeds or skins. Refrigerate the mixture until thoroughly cold, about 4°C (40°F). A warm fruit base melts the cream's structure before the freezer can preserve it.

3. 3

   Whip the Chantilly

   Whip the 270 g of cold heavy cream at medium speed until the whisk begins leaving clear tracks. Rain in the confectioners' sugar and continue until the Chantilly forms sharp, upright peaks and stays firmly in the bowl when it is tilted. Very stiff does not mean grainy. If the surface starts looking rough, stop immediately. Ça se rattrape: whisk in the optional cold cream one teaspoon at a time by hand until the Chantilly is smooth again, then weigh 300 g for the mousse. If the peak bends or slowly slumps, it is still too slack and will freeze icy; give it another few seconds before any fruit touches it.

   Use real heavy cream with at least 35% fat. Light cream cannot hold the amount of air this preparation asks it to carry.
4. 4

   Fold without losing air

   Whisk about one quarter of the Chantilly into the fruit base to bring the two mixtures closer in density. Add the remaining Chantilly in two portions, cutting down through the center with a broad spatula, sweeping along the bowl, and lifting the mixture over itself while turning the bowl. Stop as soon as the color is even. A few faint pale threads are safer than another dozen strokes; overfolding drives out the air that gives a mousse glacée its fine, light texture.

5. 5

   Mold and freeze

   Divide the mousse among the chilled molds without knocking the tray or tapping out the air. Level the tops lightly, cover them closely, and place the tray in the coldest part of the freezer at once. Freeze undisturbed for at least 6 hours, preferably overnight. No churning is needed. The syrup controls the freeze while the stiff Chantilly holds the air.

6. 6

   Temper and unmold

   Move the mousses to the refrigerator for 15 minutes, or leave them at room temperature for about 5 minutes. For rigid molds, loosen the edge with a thin knife and wrap the outside briefly in a warm damp cloth before turning each mousse onto a chilled plate. If the surface softens before the center releases, return it to the freezer for 10 minutes and try again with less warmth. The spoon should meet slight resistance, then pass through a fine, airy frozen interior. Serve at once. À table!

Chef Tips

• •Use unsweetened fruit purée. Raspberry, blackcurrant, strawberry, apricot, and peach all carry enough perfume and acidity to remain vivid from the freezer. Outside their season, an unsweetened frozen purée made from ripe fruit is the honest choice; thaw it in the refrigerator and strain it before weighing.
• •The syrup quantities make a small working excess on purpose. Weighing 150 g only after the syrup has cooled protects the book's ratio from whatever clings to the saucepan, while the remaining syrup keeps for another batch.
• •Trust the scale before the cup. Fruit purées vary in thickness and whipped cream changes enormously in volume, but 150 g syrup, 150 g purée, and 300 g finished Chantilly always preserve the formula.
• •For twelve servings, double the three finished weights to 300 g syrup, 300 g purée, and 600 g Chantilly, but fold the mousse in two bowls. A vast bowl warms while one cook struggles through it, and warmth costs air.

Advance Preparation

• •The 35° Baumé syrup can be prepared up to one week ahead and refrigerated in a covered jar. Bring it back to a fluid consistency in the refrigerator before weighing, never over direct heat.
• •The syrup and strained fruit purée can be combined up to 24 hours ahead and kept covered in the refrigerator. Whisk them smooth again before folding in the Chantilly.
• •Freeze the finished mousses at least 6 hours ahead. Once firm, wrap each mold closely; they keep their best flavor and texture for about two weeks in the freezer.

Frequently Asked Questions

Nutrition Information

1 serving (about 110g)