Stir the fat and sugar until creamy. Stir in eggs one at a time. Stir in the crème fraîche and the lemon zest. Mix in flour, baking powder and salt and stir in.
Grease a springform pan (26 cm diameter). Smooth out the dough in the form, spread the cherries on top. Bake the cake in a preheated oven (electric stove: 175 ° C / fan oven: 150 ° C) for about 45 minutes. Take out and let cool in the form on a rack.
Chop the couverture and melt it in a water bath. Allow to cool slightly.
Take the cake out of the tin and place on a cake plate. Pull the couverture over the cake in strips with a spoon, allow to set.