Tomato Sweet Potato Soup

Adapted from Simply in Season, serves 4-6
Date made: 1/28/2011

1 medium onion, chopped
3 medium-small sweet potatoes, peeled and chopped*
4 c vegetable broth
1 c water
1 28 oz can of diced tomatoes
1/4 tsp ground pepper
3/4 c orange juice

Saute onion in oil in soup pot until translucent.  Add sweet potatoes, broth, and water, and bring to a boil.
Reduce heat and simmer, partially covered, until sweet potatoes are tender, about 25 minutes.
Remove from heat and stir in tomatoes with juice and pepper.  Puree until smooth and return to soup pot.
Add orange juice, heat gently until hot, and serve.

My sweet potatoes were a little on the small side so if I had to do it again, I'd cut back on either the tomatoes or the orange juice or add another sweet potato to cut the acidity.  The texture is interesting since it has a lot of the acid, but a hint of that starchy, almost creamy finish from the potatoes.  Knowing this, next time I might add a little cream or half-and-half instead of the cup of water.