Spinach Souffle

Ingredients (10)

• 1 package (10 ounces) fresh spinach
• 1/4 cup butter, cubed
• 1/4 cup all-purpose flour
• 1/4 teaspoon pepper
• 1 cup milk
• 1 teaspoon dried minced onion
• 1 teaspoon salt
• 1/8 teaspoon ground nutmeg
• 3 eggs, separated
• 1/4 teaspoon cream of tartar