In a bowl, combine the first six ingredients. Stir in walnuts if desired. Roll out pastry to 1/8-in. thickness; cut into 48 3-in. circles; moisten edges with water. Put 1-1/2 teaspoons filling on half of each circle. Fold other half over the filling; press edges together with a fork to seal. Cut a slit in top of each tart. Place on a lightly greased baking sheet. Bake at 375° for 13-15 minutes or until lightly browned. Remove to wire racks to cool. Combine sugar and milk; drizzle over cooled tarts.
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