A recipe for making lemon sauce – No. 2 Boil the strained juice of two lemons and the grated peel of one with a cup of sugar and one glass of white wine or water. When boiled to a syrup add the yolks of three eggs well beaten, also half of the whites beaten to a froth. Use the other half of the stiffly-beaten whites, sweetened with powdered sugar, to decorate the sauce. Serve immediately.