Question: Mornay sauce includes what type of hard yellow cheese?
Sentence (from "Gruyère cheese"): Gruyère ( or ; ] , German: "Greyerzer") is a hard yellow cheese, named after the town of Gruyères in Switzerland, and originated in the cantons of Fribourg, Vaud, Neuchâtel, Jura, and Berne.
Relevant evidence: Yes