Rub in the butter finely, leaving the mixture cool and powdery.
Stir in the currants or raisins.
Or pulse the dry ingredients in the work bowl of a food processor fitted with the metal blade.
Add the butter, cut into 8 pieces and pulse again six or eight times until finely mixed.
Pour into a bowl and stir in the currants or raisins.
Beat the eggs with the lemon zest and vanilla extract. Stir into the flour mixture with a fork.
Flour the dough lightly and divide it into 4 pieces. Roll them into cylinders about 1 inch in diameter. Flatten the cylinders slightly and cut them diagonally at 1 1/2-inch intervals, making diamond shapes.
Arrange the zaleti on paper-lined cookie sheets and bake at 350 degrees F for about 15 minutes, until they are light golden in color.