Preheat oven to 350 degrees.
In large bowl cream butter and sugar. Add eggs one at a time to cream mixture.
In medium bowl sift together flour and baking powder. Slowly add in alternating portions of milk and flour to the butter mixture.
Once the batter has completely come together, add the zest and the juice.
Add batter to a very well buttered and floured baking pan.
Bake for 1 hour, or until toothpick inserted in center comes out clean.
Enjoy!
Submitted by: Maria Gribben