Tomatoes stuffed with Vegetables

Description
In Romanian: Rosii umplute cu zarzavat

Ingredients

 * 3 boiled potatoes,
 * 2 carrots,
 * 1 parsnip,
 * 1 celery root,
 * 2-3 tablespoon peas (optional),
 * 1 chopped onion,
 * mayo,
 * tomatoes,
 * salt,
 * lettuce

Directions

 * 1) Boil all the vegetables except the onion, tomatoes and lettuce. Let cool then cube everything and mix with the chopped onion and salt.
 * 2) Mix the vegetables with mayo and then stuff the tomatoes from which the insides have been removed, with the mixture. Refrigerate. When serving, place them on a bed of chopped lettuce.