Simplify the following text for a Grade 7 native English-speaking person.
Original: Hollandaise sauce is an emulsion of egg yolk and butter , usually seasoned with lemon juice , salt , and a little white pepper or cayenne pepper .
Simplified: Hollandaise sauce is an emulsion of egg yolk and butter . Lemon juice , salt , and a little white pepper or cayenne pepper are often added as seasoning .