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Set racks in middle and upper part of oven. Preheat oven to 350°F.
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Cream butter and sugar together.
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Mix flour and baking powder together. Add to butter mixture, mixing well.
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Stir in 1/2 cup water and mix to form dough.
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Roll on floured board to about one inch thick.
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Cut in pieces about 2 inches by 1 inch.
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Roll each piece in sesame seeds.
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Arrange pieces on a greased baking sheet.
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Bake until golden brown, about 30 minutes.
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Cool on wire rack.
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Store at room temperature in airtight tin or plastic container.