Unsalted Butter (Best Option)
1 tablespoon per egg yolkUnsalted butter is the traditional fat used in Hollandaise sauce, offering an ideal balance of fat and water content that facilitates stable emulsification with egg yolks and acid. The milk solids in butter also contribute to flavor complexity and mouthfeel.
When substituting, use unsalted butter to control salt levels and melt it gently to avoid overheating, which can cause separation. Gradually incorporate the butter while whisking vigorously to maintain a smooth emulsion.
Compared to coconut oil, butter imparts a more classic flavor profile and a silkier texture, making the sauce taste more authentic and luxurious.