Ingredient:

• 5 tablespoons olive oil, divided
• 1 tablespoon butter
• 8 cups thinly sliced onions (about 3 pounds)
• 3 garlic cloves, minced
• 1/2 cup port wine or dry sherry
• 2 cartons (32 ounces each) beef broth
• 1/2 teaspoon pepper
• 1/4 teaspoon salt
• 24 slices French bread baguette (1/2 inch thick)
• 2 large garlic cloves, peeled and halved
• 3/4 cup shredded Gruyere or Swiss cheese