Mix mascarpone, curd and sugar with the whisk of the hand mixer. Dissolve the coffee powder in 8 teaspoons of water. Stir half of the coffee and 2 tablespoons of mineral water into the mascarpone cream. Carefully swirl the remaining coffee with a fork. Carefully pour into glasses so that the marbling is not lost.
Place 1 tablespoon of each chocolate-coated coffee bean on the cream and dust with icing sugar.