Pasta e Fagioli (Pasta and Beans)

Pasta e Fagioli (Pasta and Beans)
Ingredients:
1 carrot, diced
1 small onion, diced
1 celery root, diced
chopped parsley
2 Tbs butter
2 Tbs olive oil
salt
1 7 oz can of tomatoes, diced
1 -10 oz can of cannelini beans, drained
7 oz of small shaped pasta
Grated parmesan cheese

Preparation:
In a large pot saute onion, carrot, celery, parsley, butter and 2 Tbs oil.
Add tomatoes, beans, water, salt and bring to boil. Reduce the heat, and simmer, covered, until the beans are tender.
Transfer about 2 cups beans and their liquid to a food processor and process to a thick puree. Stir the puree back into the beans.
Add pasta, cook, stirring constantly, until the pasta is tender.
Serve with parmesan cheese.