Deep-Dish Ham Pie

Ingredients

• 1/4 cup butter, cubed
• 1/4 cup all-purpose flour
• 1/2 teaspoon salt
• 1/4 teaspoon ground mustard
• 1/8 teaspoon pepper
• 1 cup milk
• 1 teaspoon dried minced onion
• 2-1/2 cups cubed fully cooked ham
• 1 cup frozen peas, thawed
• 2 hard-boiled large eggs, chopped
• Pastry for single-crust pie (8 inches)