Hollandaise sauce mayonnaise and Béarnaise, the egg does not coagulate as in a custard; rather, the lecithin in the eggs serves as an emulsifier, allowing the mixture of the normally immiscible butter and lemon juice to form a stable emulsion. To make hollandaise sauce, beaten egg yolks are combined with butter, lemon juice, salt, and water, and heated gently while being mixed. Some cooks use a double boiler in order to control the temperature. Some recipes add melted butter to warmed yolks; others call for unmelted butter and the yolks to be heated together; still others combine warm butter and eggs in
La Fête espagnole praise directed toward Delluc, and not Dulac. For Delluc's part, he never avoided praising Dulac's contribution to the success of the film, stating that it was "a rare example of complete cooperation in French cinema. Author, director and actors have agreed, through their specific affinities and willingness to work, to seek the absolute realization of the chosen theme." Ève Francis commented that "La Fête espagnole" "had a staggering effect on the filmmakers then. The accelerated movement of this synthetic drama, suffused with poetry, was an unprecedented novelty." Delluc's original screenplay consisted of 217 numbered scenes, with each scene indicated by