Copycat Panera Bread Black Bean Soup

This isn't quite enough for 4 people.  Next time I might make more.  Our two kids eat about a half serving each, and we were scraping the bottom, as they both wanted seconds.

1 onion, finely chopped
2 garlic cloves, minced
2 celery ribs, finely chopped
1/4 large red bell pepper, finely chopped
2 small chicken bouillon cubes
1 -1 1/2 cup boiling water
2 (15 ounce) cans black beans, undrained
1/2 teaspoon salt
1/2 teaspoon cumin
1/2 lemon, juice of
1 1/2 tablespoons cornstarch
Directions:

1
In a pot, combine the first six ingredients; simmer for 10 minutes.
2
Add half a can of beans, salt and cumin; cook for 5 minutes.
3
Puree soup (I use an immersion blender which makes it easy to do it right in the pot).
4
Add the rest of the beans to the soup.
5
Combine the cornstarch with 1 1/2 tablespoons of water.
6
Add the lemon and the cornstarch to the soup; cook until thickened.

Read more: http://www.food.com/recipe/panera-bread-black-bean-soup-49737?oc=linkback