preheat oven at 190°. Knead butter soften with sugar until you obtain a cream. Add peel of ½ orange and peel and juice of ½ lemon. Add grapefruit juice and mix. Add flour and bicarbonate and sieve. Knead citrus fruit mixture with flour. Let it stand in fridge for 20 minutes. Insert the mixture in shooter and "shoot" cookies on a baking tray. Baking for 10 minutes.
