Place bacon in a large, deep skillet. Cook over medium high heat until evenly browned. Remove from skillet, crumble, set aside.
To the hot bacon drippings, add the vinegar, lemon juice, sugar and pepper Stir over medium heat until hot.
In a large bowl, combine the lettuce and green onion. Add the warm dressing and toss to evenly coat. Sprinkle with bacon and serve.