Fresh berries may be washed, sorted and drained. Defrost frozen berries and drain. Divide into four ramekins (approx. 300 ml each).
For the wine mousse, beat the egg yolk, sugar, starch and wine in a metal bowl. Then beat in a hot water bath until the volume has approximately tripled. Finally, briefly fold in the liqueur.
Pour wine mousse over the berries and sprinkle with brown sugar. Cook briefly in a preheated oven (electric cooker: 250 °C/circulating air: 225 °C/gas: see manufacturer) until the sugar caramelises to a golden brown. Serve immediately.
When whipped, the wine froth becomes thick and airy. Continue using it quickly so that it does not collapse again