Recipe for homemade tomato sauce

Here is one of my kids favorite dinners, Spaghetti! I know, we all know how to make it, you boil water, add some sauce and serve, right? Well give making your sauce from scratch a try! Here is my recipe, and some additions that we can't use but that doesn't mean others can't enjoy them.

For 4 people:

4-10 Roma tomatoes (others work too but decrease your liquid by 1-2 Tbs for every tomato,
        depending on how juicy it is)
2 stalks celery
1 cup chopped mushrooms
2 cups water or stock
1 bell pepper
2 Tbs Italian seasonings (or whatever you prefer)
1 cup frozen or blanched spinach


**Also try:
Onions
corn
green beans/ peas
sausage
ground meat (turkey, beef, etc.)
zucchini
squash
Whatever else sounds good

** If you are going to add meat you can cook that up either with the vegis or before hand.

Instructions:
1) Saute peppers, mushrooms, celery, and any other vegi you want to add until just tender (they are going to cook some more so don't make them well done!)
2) While those are cooking chop up your tomatoes into bite sized pieces. When the sauteed vegis are done, remove them from the heat and set aside.
3) Place tomatoes into skillet and cook at medium heat 5-7 minutes, until the meat comes away from the skin and everything becomes mushy. Add seasoning and liquid and mix together well.
4) When it begins to simmer turn temp down to low and add the sauteed vegis into the tomatoes.
5) Let simmer and stir occasionally while you bring water to a boil and cook your pasta. If you feel the need to add more liquid to the sauce while it simmers do so in 1/4 cup or less increments.

This is the way we like to make it, but if you like more soupy sauce feel free to make it that way!

Enjoy! And if anyone makes this let me know, tell me what you think and what you think I need to change or try.