|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.