World's Best Baked Onions Recipe | Epicurious

Ingredients

• 4 tennis-ball-size onions (8 to 10 oz each), peeled but not trimmed
• 4 (4-inch-long) fresh rosemary sprigs
• 2 garlic cloves, finely chopped
• 2 tablespoons olive oil
• 1/2 cup heavy cream
• 1 oz finely grated parmesan (1/2 cup)
• Fine sea salt to taste
• 4 pancetta slices, unrolled to form strips, or bacon slices