What is the best recipe for a gritty cheese sauce that will impress my guests?

To make a delicious and impressive gritty cheese sauce, start by melting butter in a saucepan over low heat. Add flour to make a roux, then slowly whisk in milk until smooth. Stir in grated sharp cheddar cheese until melted. For a gritty texture, add a small amount of finely grated Parmesan cheese. Season with salt, pepper, and a pinch of cayenne for a kick. Serve over pasta or vegetables for a tasty dish that will wow your guests.