Drain the tangerines. Whip the cream. Mix the mascarpone with low-fat quark until smooth and season with sugar, 100 ml orange juice and the orange liqueur. Carefully fold in the cream.
Line a baking dish (approx. 1.5 liters) with approx. Half of the amarettini. Drizzle with about 50 ml of orange juice and sprinkle the mandarins on top. Brush with a little cream. Spread the remaining amarettini on top and again drizzle with approx. 50 ml orange juice. Put the leftover cream on top, smooth it out and refrigerate for about 2 hours.
Dust with cocoa powder. Garnish with orange slices and mint if you like.
Tip: Layer 500g fresh strawberries instead of the mandarin oranges.