- 1 stick unsalted butter
- 4 egg yolks
- 2 tbs fresh lemon juice
- 1/4 cup boiling water
- dash of salt to taste
- Cream butter in a small bowl until fluffy.
- While beating, add egg yolks one at a time, then very gradually add the lemon juice, then salt and water.
- Mixture will be thin.
- Heat in a double boiler over hot water, stirring until thickened.