Penne Pasta with Tomato Cream Sauce

We went italian last night. I'm not a huge onion fan and this dish tasted pretty oniony in my opinion but my husband loved it. He ate all of mine, his, and he ate the leftovers for breakfast! He is a huge pasta lover and he thought the dish was great. This dish has been approved for repeat by my picky eater.

Penne Pasta with Tomato Cream Sauce 
Source
(I halved the recipe. If you're cooking for 6-8 click on "source" for the whole recipe.)

Ingredients:
1 tbs olive oil
1 tbs butter
1/2 whole medium onion, finely diced
2 cloves garlic, minced
1 can tomato sauce
salt and pepper to taste
dash of sugar
1 cup heavy cream (I didn't have any cream so I melted 1/6 butter (half of one third cup. just eyeball it.) and 1/4 plus 1/8 cup milk. Mixed it together and substituted it.)
Parmesan Cheese
Basil
1/2 lb Penne Pasta

Directions:
Cook pasta according to package directions. Drain, reserving 1 cup of pasta water.

Heat butted and oil over medium heat. Add onions and garlic and saute for a minute or so. Pour in tomato sauce and add salt, pepper, and sugar to taste. Stir and cook over love heat for 25 to 30 minutes, stirring occasionally.

Remove from heat and stir in cream. Add cheese to taste, then check seasonings. Stir in pasta and basil and serve immediately. (Thin with paste water before adding basil if needed.)