For this recipe you will need unsalted butter, egg yolks, lemon juice, salt, cayenne pepper, and Dijon mustard. So few ingredients, so much flavor and richness.
Dijon mustard isn’t an ingredient in many Hollandaise recipes, but it does play an important role here. “Just a tiny teaspoon really elevates the hollandaise’s flavor and adds a tangy tartness with a little kick,” says Dalton. Mustard is also a great emulsifier, which will help keep the sauce smooth and uniform.