Brussels Sprouts without pumpkin sprinkles

1 small onion , sliced 2 tablespoons butter 2 tablespoons flour 1 teaspoon sugar 1 cup tomato juice 1/2 teaspoon salt 1/8 teaspoon pepper 2 (10 ounce)[...]

2 -3 lbs Brussels sprouts 1/4 cup butter 1/4 cup flour 1 cup chopped onion 2 cups warm homogenized milk 1 1/2 cups shredded old sharp white cheddar cheese[...]