A thick, silky cheddar-and-garlic cheese sauce that pours smoothly and clings to fries without graininess. Ready in about 10 minutes and easily adjustable for spice or extra garlic.
Makes about 2 cups. For best texture, freshly grate the cheddar and keep heat low when adding cheese. Whisk constantly to prevent lumps. Store cooled sauce in an airtight container up to 4 days; reheat gently on low, whisking and adding milk as needed. Sauce can be frozen up to 1 month but may slightly separate; whisk in a teaspoon of cold milk off heat to fix. Variations: add extra garlic or roasted garlic paste, stir in hot sauce or cayenne for heat, swap part of the milk for lager for beer-cheese vibes, or mix cheddar with pepper jack for a smoky nacho style. For gluten-free, use a 1:1 GF flour or thicken warm dairy with 2 teaspoons cornstarch mixed with 2 tablespoons cold milk.