Wash the lemons with hot, dry them well and finely rub the peel.
Put all ingredients, except for the flour and baking powder, in a large bowl and stir together. Then stir in the flour mixed with baking powder. The rum serves to prevent the pastry from absorbing as much fat.
Heat the frying oil in a stainless steel saucepan on medium heat. Cut off the cams with a tablespoon, place in the hot fat and bake slowly. Drain briefly on kitchen paper and toss in sugar while it is still hot.