Put the cottage cheese in gauze to drain for about two hours. Put it into a bowl with the lemon zest and add 100 g of sugar. Beat the cream of hard snow and add powdered sugar. Stir gently and mix it with the cottage cheese. Beat the egg whites with a pinch of salt, also on hard snow, and add them to the cottage cheese. Take four porcelain shapes type heart and cover them with plastic foil. Fill them well. Leave in the fridge for about four hours. Before serving, wash the strawberries, clean them and cut them in two but not to end so as to dissolve to get heart. With them and mint garnish removed from the trays scoured hearts.