Potato Gratin With Caramelized Onion and Prosciutto (Or Bacon)

Ingredients

• 5 lbs onions
• yellow (about 6 very large)
• 12 cup vegetable oil (see note below
• in directions)
• 1 tablespoon salt
• 3 lbs wax potatoes
• unpeeled (about 7)
• 3 12 cups milk
• 12 cup heavy cream
• 2 -3 garlic cloves
• 2 bay leaves
• butter
• 4 slices prosciutto
• thinly sliced (or 6 slices bacon
• cooked and crumbled)
• 6 ounces gruyere or 6 ounces emmenthaler cheese
• grated
• white pepper (optional)

Instructions

No instructions listed