Ingredients
- 1 1/2 tablespoons unsalted butter
- Additional butter to grease dishes
- 1 1/2 tablespoons unbleached flour
- 1/2 cup whole milk
- 2 eggs; separated
- 1/4 cup Gruyere, grated
- 2 tablespoons Parmesan cheese, finely grated
- 1/2 teaspoon ground mustard
- 1/4 teaspoon salt
- 1/4 teaspoon white pepper
- 1/4 teaspoon cream of tartar
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