POTATO SOUP - Home made easy vegetable soup

POTATO SOUP 

Ingredients : 

Potatoes  - 2
Onion   -   1
butter   - 2 tbsp
water    - 3 cups
milk      -  1 cup 
Salt 
Pepper 

Procedure :

1. Mince the onion and saute in the butter
2. Add the water , potatoes and seasonings 
3. Cook till the potatoes are done 
4. Remove from fire and pass through a sieve 
5. Reheat stir in milk and simmer slowly for  5 minutes stirring occasionally .
6. Put some extra butter if desired and serve hot