Blend the flour, sugar, baking powder and salt with the butter in a food processor until the mixture looks like coarse sand. Fold in the egg yolks and buttermilk. Remove the mixture from the food processor and blend in the raisins, walnuts and fennel seed. Gently knead the dough with floured hands into a smooth ball. Then roll the ball into a long sausage. Cut the sausage in half, then cut these two pieces in half and continue cutting until you have 12 equal pieces. Quickly roll each piece into a small ball and place each ball in its own clay flower pot. Spread beaten egg on top of each ball.
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