1 (2 lb.) box extra thin spaghetti, cooked and drained
1 (8 oz.) bottle Wishbone Italian dressing
3/4 jar McCormick's Salad Supreme seasoning
3 med. tomatoes, chopped
1 cucumber, sliced in quarters
1 red onion, sliced and divided into rings

Combine all ingredients and mix well. Cover and refrigerate overnight before serving. Serves 10.