Swiss Chard and Leek Gratin

Ingredients

• 3 pounds Swiss chard, large stems discarded
• 3 tablespoons extra-virgin olive oil
• 6 medium leeks, white and tender green parts only, sliced 1/4 inch thick
• Salt
• 3 garlic cloves, minced
• 6 tablespoons unsalted butter
• 2/3 cup all-purpose flour
• 1 quart whole milk
• 1/2 cup shredded Gruyère cheese
• 1/2 cup freshly grated Parmigiano-Reggiano cheese
• 1/4 teaspoon freshly grated nutmeg
• Freshly ground pepper

Preparation

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