- 4 large sweet onions such as Vidalia, Walla Walla, or Oso Sweet
- 8 bacon slices (1/2 pound)
- 1 ½ cups water
- 1 ½ cups tomato juice
- 2 tablespoons unsalted butter
- ½ teaspoon salt
- 2 tablespoons molasses (regular or robust; not blackstrap)
Put oven rack in middle position and preheat oven to 400°F. Peel and trim onions, keeping root ends intact, then halve each lengthwise. Arrange, cut sides up, in 1 layer in a 13- by 9- by 2-inch glass baking dish or other 2 1/2-quart shallow baking dish. Bring tomato juice, water, butter, molasse...