I remember my grandmother making these homey jam-filled biscotti from the scraps of pasta frolla left over from baking all the traditional pizze and torte for Easter every year. Since this is a very casual recipe, feel free to vary it in any way you please, substituting another flavor of jam. In the (Mosaici), almonds, hazelnuts, candied cherries, and golden raisins are kneaded into the dough for a lovely mosaic efffect.
For the dough, combine the dry ingredients in a mixing bowl and stir well to mix. Rub in the butter, leaving the mixture cool and powdery, without allowing it to become pasty. Whisk the eggs with the orange zest and vanilla and stir into the flour mixture to form a dough. Knead lightly on a floured surface by folding the dough over on itself 3 or 4 times. Wrap in plastic and chill until firm, about 1 hour.
To form the biscotti, divide the dough into
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