Love this soup- I like to cut the beans in half and add some eggplant to the onions/carrots during the saute part. It's definitly worth hunting down the escarole instead of the spinach.
Escarole & White Bean Soup
Don't be afraid of escarole, which looks like slightly frilly romaine lettuce, because it cooks down into a sweet and tender green. If you can't find it, substitute a 10-ounce bag of spinach. Make It a Meal: Warm crusty bread and a green salad make an excellent accompaniment.