Scald the milk, add the sugar and salt; when lukewarm, add yeast cake, crumbled, with a teaspoon of sugar; let stand 5 minutes, add 3 cups flour; beat well, cover and let rise in a warm place until light. Add eggs, beat well; the butter softened, lemon juice and rind and just enough more flour to knead. Knead ½ hour or until the dough is smooth and elastic and blisters. Cover and let rise again in a warm place. Form into any desired shape, place into pans, well greased with butter, let rise again and bake.