Wash the limes, rub dry. Grate the peel of 1 1/2 limes. Squeeze limes. Mix mascarpone, yoghurt, 120 g sugar, vanillin sugar, lime zest and 4 tablespoons lime juice. Whip cream until stiff and fold in with a whisk.
Drain the apricots and puree with 2 tablespoons of sugar. Distribute mascarpone cream and apricot puree in layers in 10 glasses. Stir gently with a teaspoon to create streaks. Glasses min.
Freeze for six hours, preferably overnight.
To serve, place ice cubes on a waterproof tray or in an ovenproof dish. Place glasses inside.