What is included in the sauce choron served with the brasserie steak and eggs?

Sauce choron is a classic French sauce that is essentially a variation of hollandaise sauce with the addition of tomato puree. This combination not only incorporates the rich, buttery qualities of hollandaise but also adds a depth of flavor and a hint of acidity from the tomato. The hollandaise provides a creamy texture and a luxurious mouthfeel, making it an ideal pairing for dishes like brasserie steak and eggs.

While hollandaise is the base of sauce choron, the other options do not correctly represent its components. Mayonnaise is a different type of emulsion and is not part of this sauce. Truffle oil is a flavor enhancer but is not traditionally included in sauce choron. Tomato puree, while vital, is part of the hollandaise adaptation rather than a standalone component. Therefore, the inclusion of hollandaise sauce as the foundation for sauce choron makes it the correct answer in the context provided.