Liquify the butter.

Add the sugar, salt and a tablespoon of milk to the butter and mix the lot.

Heap the flour on the counter, make a hole in the heap and pour the butter mixed with the other ingredients, the egg, the egg yolk, the rum and the juice and grated rind of half a lemon.

Work the dough for about half an hour. Add a little milk if necessary to keep the dough soft.

Roll out the dough very thinly.

Cut the dough into whatever shapes you want (strips, rectangles, triangles...)

Fry the dough shapes and dust with icing sugar.