- ¼ cup milk
- ¼ cup sugar
- 1-inch pi
- Bring milk, sugar and vanilla bean to a boil; do not let the mixture boil over.
- Reduce heat. Stir in the ground walnuts and lemon juice. Let the filling simmer until thickened. Shut off heat and let the filling cool. Discard vanilla bean.
- After filling is completely cooled, whip the butter in a separate bowl till it is foamy. Then whip in the walnut f