Mix the flour, lemon zest and salt. Mix the yeast and 1 tablespoon sugar until liquid. Add the rest of the sugar and yeast to the flour. Melt the fat, pour in the milk, add to the flour. Knead, let rise for 30 minutes.
Knead the dough again, roll out 1 cm thick and cut out 6 hearts. Let rise for 15 minutes. Brush with cream and sprinkle with sesame seeds. Bake at 200 ° C for about 12-15 minutes.