Grease and flour a 9-inch fluted tube pan. Heat oven to 350 degrees F.
Streusel Filling: Mix ingredients and set aside.
Cake: Resift flour with baking powder, baking soda, salt and mace.
In large bowl, combine butter, sugar, eggs and vanilla extract. Beat for 2 minutes
on medium speed (batter may appear curdled). On lowest speed, blend in flour alternately
with sour cream and Kahlua. Turn 1/3 batter into prepared pan. Cover with 1/2 Streusel
Filling, an additional 1/3 batter and remaining Streusel. Top with remaining batter.
Bake on rack below oven center for 45 minutes or until golden brown.
Remove and let stand 10 minutes.
Invert on cake rack; cool until lukewarm (with pan on top).
While cake is cooling, prepare Kahlua Glaze.
Kahlua Glaze: Combine ingredients and beat until smooth.
Remove pan and spoon glaze over top of lukewarm cake. Top with pecan halves if