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3 Tbsp unsalted butter
1/2 cup minced yellow onion
1/3 cup all-purpose flour
4 cups whole milk, room temperature
salt and pepper
2 bunches curly- or flat-leaf spinach (about 1 3/4 lbs total), trimmed, washed, and cut crosswise into 1/2-inch-thick strips
5 oz Gruyere cheese, grated (2 cups)
3/4 lb elbow macaroni, cooked according to package instructions
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