In a small bowl, combine the flour, baking powder and 1/3 cup sugar; cut in 1/2 cup butter until crumbly. Beat 1 egg; add to flour mixture, tossing with a fork until dry ingredients are moistened. Press dough evenly onto bottom and up the sides of a 9-in. tart pan with removable bottom. Spread 1/4 cup of jam over dough. Cover with a plastic wrap and refrigerate.
Meanwhile, cream remaining butter and sugar until light and fluffy; stir in almonds and extract. Add remaining eggs, one at a time, beating well after each addition; spoon filling over jam. Place tart pan on a baking sheet.
Bake at 350° for 50-55 minutes or until set. Cool in pan on a wire rack. Carefully remove sides from pan. Spread remaining jam on top. Combine confectioners' sugar and lemon juice; drizzle over the top.
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