Wash, halve and stone the apricots. Mix with 3 tablespoons lemon juice and 1 tablespoon sugar. Marinate for about 30 minutes
Mix eggs, 5 tablespoons sugar, grappa, grape juice, the rest lemon juice, zest and starch in a tall narrow pot until smooth. Whisk over medium heat with the whisk of the hand mixer until thick and frothy
Place the apricots in 4 greased ovenproof baking dishes or 1 large dish. Add the foam. Bake in a preheated oven (electric cooker: 225 °C/recirculating air: 200 °C/ gas: level 4) for 8-10 minutes. Dust with icing sugar and decorate with melissa. Serve immediately