Wash the apricots and cut them into slices from the stone. Caramelise 50 g sugar in a pot. Deglaze with 5 tablespoons of sherry and simmer until the sugar has dissolved. Marinate apricots briefly in hot syrup.
Mix 2 tablespoons sherry, lemon juice, 50 g sugar and mascarpone. Arrange mascarpone and apricots in small bowls and sprinkle with pistachios.