Place bacon in a large, deep skillet. Cook over medium high heat until evenly brown. Drain, and crumble.
In a large bowl, combine broccoli, cheese, bacon and onion.
Prepare the dressing in a small bowl by whisking together the red wine vinegar, sugar, pepper, salt, mayonnaise and lemon juice.
Combine dressing with salad. Cover, and refrigerate until ready to serve.