1. Mix butter with condensed milk
2. Add butter and mix well
3. Add 1 whole egg and 5 egg yolks in three times, mix well
4. Beat sugar with 5 egg whites until firm
5. Add the egg white to the milk/flour batter in 3-4 times.
6. Prepare the baking pan with parchment paper, butter and flour.
7. Pour the batter and bake at 350F for 30 min until the stick comes out clean.