Roasted Garlic without eggs swiss

1 whole garlic head 4 ounces pancetta, chopped 2 cups vertically sliced onion 1 tablespoon olive oil 1 tablespoon white wine vinegar 4 1/2 cups (1/2-inch)[...]

5 whole garlic heads, unpeeled 3 1/2 tablespoons olive oil, divided 1 1/4 teaspoons salt, divided 1 teaspoon freshly ground black pepper, divided 10 shallots,[...]