Ingredients
- 1/4 cup (1/2 stick) unsalted butter
- 2 pounds fresh spinach, stemmed
- 1 1/2 cups (lightly packed) grated Pecorino, Parmesan, or Manchego cheese (about 3 ounces)
- 1/4 cup crème fraîche
- 1 teaspoon Dijon mustard
- Kosher salt and freshly ground black pepper
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