Heat oven to 350.
Grease & flour 10 inch tube or bundt pan.
Mix all of the cake & ingredients together including 1/2 cup rum only. Reserve other 1/2 cup for glaze, and pour into pan.
Bake for 1 hour.
Melt butter in pan, stir in pineapple or orange juice, add sugar, boil for 5 minutes, stirring constantly. Remove from heat, add remaining 1/2 cup rum, and stir.
Poke top of cake all over with fork.
SPOON glaze over cake, then SPREAD with a glaze brush over top of cake.
Allow cake to absorb the glaze.