BACON DRESSING:

1/4 c. cider vinegar
1/2 c. vegetable oil
2 tsp. Dijon mustard
2 tbsp. brown sugar
1 tsp. seasoned salt
1/4 tsp. pepper
4 slices bacon, cooked crisp and crumbled
2 tbsp. chopped green onion

SALAD:

6 c. red leaf lettuce
6 oz. Swiss cheese
6 oz. cheddar cheese
2 c. seedless grapes

In a small bowl, whisk together all ingredients for bacon dressing, except for bacon and onion. Blend thoroughly. Cover and chill several hours. Just before serving, mix dressing thoroughly. Pour dressing over lettuce, grapes and shredded cheese and toss thoroughly.