This is a real classic. It's one of the first my Grandma put into the family cookbook. I'm not sure if you can still find Beau Monde seasoning anymore. I also have this in my Becky's Cookbook collection and use any favorite vegetable seasoning.
1 pt. sour cream
1 pt. Hellmann's mayonnaise
1 T. Beau Monde
1 T. dill weed
1 T. grated onion
Mix all together and serve with vegetables. Really good.