Broccoli and Cauliflower Salad

1 lb. fresh cauliflower, chopped
1 lb. fresh broccoli, chopped
1 small onion, chopped
1/3 c. vinegar
1/3 c. sugar
2/3 c. mayonnaise
1 t. salt

Combine broccoli, cauliflower, and onion; toss well. Combine remaining ingredients, mixing well. Pour over vegetables. Cover and refrigerate overnight.

Serves 6 to 8.