Caramelized Onion-Potato Tart

Ingredients

• 0.3 cup firmly brown sugar packed
• 0.5 cup butter divided
• 2 tablespoons cooking sherry dry
• 2 large eggs lightly beaten
• 7 tablespoons flour all-purpose divided
• 1.5 cups milk 
• 0.3 teaspoon pepper 
• 24 ounce potatoes frozen with peppers and onions
• 1 teaspoon salt 
• 2 pounds onions sweet ( 6 small)

Equipment

• frying pan
• oven
• whisk
• tart form

Directions

1. Stir together potatoes, eggs, and 2 tablespoons flour; place in a lightly greased 10-inch tart pan.
2. Bake at 400 for 30 minutes.
3. Cut onions in half, and cut halves into slices.
4. Melt 1/4 cup butter in a large skillet over medium heat; stir in brown sugar.
5. Add onion, and cook, stirring constantly, 20 to 22 minutes or until golden brown.
6. Remove onion, and set aside.
7. Melt remaining 1/4 cup butter in skillet over low heat; whisk in remaining 5 tablespoons flour until smooth. Cook, whisking constantly, 1 minute.
8. Add milk gradually; cook over medium heat, whisking constantly, 3 to 5 minutes or until onion mixture is thickened and bubbly. Stir in salt, pepper, and sherry.
9. Pour over potatoes, and top with onion mixture.
10. Bake tart at 400 for 15 minutes or until thoroughly heated.