Soak gelatine in plenty of cold water and allow to swell. Wash lemons with hot water, dry them and rub off the skin of 1 1/2 pieces. Then squeeze out enough lemons until you reach 150 ml (for me it was 3 pieces).
Mix the quark, yogurt, low-carb sugar and vanilla flavor in a 3000 ml bowl. Put lemon juice and zest in a saucepan, heat slightly, remove from heat and dissolve the swollen, well-squeezed gelatin in it while stirring. Then mix the liquid with 4 tablespoons of the quark mass, then stir it into the quark mass and cool it for about 15 minutes until it tightens slightly and begins to set.
Meanwhile, whip the cream until stiff, fold in, transfer everything into a large bowl and let it set properly for about 4 - 5 hours. Overnight would be ideal.
To serve, prick the dumplings with a tablespoon and garnish with a little decoration. The crowd was intended for 12 people ................