Parmesan Spinach - cooking recipe

Ingredients

1 1/2 tablespoons unsalted butter
1/2 onion, minced
1 1/2 tablespoons flour
1 1/2 cups milk
2 (10 ounce) packages frozen spinach, thawed and liquid squeezed out
3/4 cup parmesan cheese, grated
1/2 teaspoon lemon peel, grated
1/4 teaspoon nutmeg, freshly grated

Preparation

In a medium saucepan, melt butter over medium heat; add onions and cook until softened, about 5 minutes.
Add flour and stir for 1 minute; remove from heat and gradually whisk in the milk.
Return to a simmer until slightly thickened, 2 minutes.
Stir in spinach, 1/4 cup water, 1/2 cup Parmesan cheese, lemon peel, and nutmeg; cook until sauce is thick and spinach is tender, 10 minutes.
Thin with additional water, if necessary, stir in remaining Parmesan, and season with salt, if necessary.