Melt the fat in a small pot, let it cool down a little. Mix flour, sugar, baking powder and salt in a bowl. Whisk buttermilk and eggs. Pour into the flour mixture while stirring and mix to a smooth, thin wafer dough.
Put 1 sorbet ball on each wafer. Serve with raspberries. Sprinkle with lemon zest and dust with icing sugar. Decorate with mint.