In a large mixing bowl beat together butter (or shortening), eggs, pineapple juice concentrate, and water until thoroughly blended. Add flour, baking soda, and baking powder; beat just until blended.
Spoon mixture evening into a 23 cm x 13 cm oiled and floured loaf pan. Bake in a preheated oven at 180ºC or 45 minutes or until knife inserted comes out clean. Cool on a wire rack.
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