INGREDIENTS
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2 tablespoons unsalted butter, divided, plus more for buttering ramekins
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8 tablespoons finely grated gruyere cheese, divided
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1/2 cup fresh or frozen peas, thawed if using frozen
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1 tablespoon olive oil
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1 tablespoon unbleached all-purpose flour
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1/2 cup whole milk
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1 teaspoon chopped mint leaves
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1 teaspoon lemon zest
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2 large eggs, separated
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1/2 teaspoon sea salt
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Fresh ground black pepper
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1 large egg white