Instructions: Preheat oven to 325 F (160 C). Grease and flour a 10 inch tube pan. Mix together the flour and baking powder. In a large bowl, cream together 1 cup butter, 1/2 cup shortening and 2 cups sugar until light and fluffy. Beat in the eggs one at a time. Beat in the flour mixture alternately with the milk, mixing just until incorporated. Stir in 2 tablespoons rum, key lime zest, 2 teaspoons key lime juice, vanilla extract and lemon juice.

Pour batter into prepared pan. Bake in the preheated oven for 90 minutes, or until a toothpick inserted into the center of the cake comes out clean.

In the meantime, make the glaze by combining 1/4 cup sugar, 1/4 cup butter and 2 tablespoons key lime juice in a small saucepan. Let it boil for a minute or two, stirring constantly. Remove from heat and stir in 3 tablespoons rum.

Allow the cake to cool in pan 10 minutes. Turn it out onto wire rack. While warm, prick the top of cake in many places with a toothpick. Pour the glaze over the warm cake. Cool completely before serving.

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