1. Mix 2 cups powdered sugar and butter on low speed. Note, I use a Kitchen Aid. When the sugar is incorporated, turn the mixer to high and beat for 5 minutes.
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2. Add 1 egg and 2/3-cup flour. Mix on low until flour is incorporated. Then beat on high for 3 minutes.
Add second egg and 2/3 cup flour. Mix on low until flour is incorporated then beat on high for 3 minutes. The mixture should be creamy and thick.
Add third egg, half the juice and half the Cointreau, the zest and 1/3 cup flour. Mix on low until flour is incorporated then beat on high for 3 minutes.
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3. Pour mixture into a pan lined with wax paper. A bread pan works well.
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4. Bake at 325° for 1 hour. Check to see if the cake done. It should be moist but not runny and will stick to a knife blade when inserted. Remove cake from oven and cool on a rack for 15 minutes.
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5. To make glaze: slowly mix the remaining juice and the Cointreau into the rest of the sugar, beating with a fork to avoid lumps.
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6. Pour glaze over de-molded cake.
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