Make tangy French dressing in salad bowl by combining all ingredients except onion and salad oil. Slowly stir in salad oil, beating constantly. When thickened, fold in grated onions.
Add lettuce in pieces in bowl, and arrange remaining vegetables over lettuce.
Season lightly with salt and pepper to taste.
Toss lightly and serve.
Notes
To make this a true "chef's salad" - consider adding chopped ham, shredded cheese, and hard boiled egg wedges.