1 1/2 cups (serving size: about 2 1/2 tablespoons)

How to Make It

Step 1

Place butter in a small saucepan over medium-low heat; cook until butter melts, stirring occasionally. Add onion to pan; cook 10 minutes or until tender (do not brown), stirring occasionally. Sprinkle flour over onion; cook 2 minutes, stirring occasionally.

Step 2

Gradually add milk to flour mixture, stirring with a whisk until smooth; bring to a simmer. Simmer 10 minutes or until thickened, stirring frequently. Strain mixture through a fine sieve over a bowl; discard solids.

Step 3

Stir in salt, pepper, and nutmeg, if desired.

Step 4

Wipe pan clean with paper towels. Return sauce to pan, and place over medium-low heat. Add Gruyère cheese, stirring until smooth. Serve immediately.

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