Tomato, Spinach, and Basil Soup

I'm not going to lie - my favorite part of this was the Parmesan cheese...until I added the kielbasa.

Ingredients
2T butter
1 large onion, minced
1 tsp minced garlic
1 1/2C milk
1 28 oz can tomato puree
1T white sugar
2C fresh spinach, torn
1/4C chopped fresh basil
1/2 tsp salt
1/4 tsp ground pepper
1T grated parmesan
(optional) 1 kielbasa sausage, sliced and pan-cooked with onions and garlic, then added in to the soup towards the end of cooking.

Preparation
Melt butter in a large saucepan over medium heat.  Saute onion and garlic for 3 minutes.  Stir in milk and cook for 2 minutes, stirring occasionally.  Stir in tomato puree and sugar.  Mix well, cover and bring to a boil over high heat.  Reduce heat to low and simmer, covered, for 5 minutes.  Add spinach, basil, salt, pepper, (and kielbasa - if desired) and simmer, uncovered, for 2 minutes, stirring occaisionally.  Sprinkle with the parmesan cheese.