1 head cauliflower
1 bunch broccoli
1 bunch green onions
1 can water chestnuts, drained

DRESSING:

1/2 c. mayonnaise
1/3 c. vinegar
1/4 c. sugar
1/3 c. oil
1/4 tsp. salt
1/8 tsp. pepper
1/4 tsp. mustard
1 tsp. horseradish

Clean vegetables and soak broccoli and cauliflower in salt water 15 minutes; drain. Slice thin the onions and chestnuts. Mix dressing and beat well. Pour over vegetables and mix lightly. Cover tightly and refrigerate 24 hours before serving. Stir occasionally.