It is always very hot where I live when the tomatoes and peppers are ripe, so I constantly seek out crock pot recipes. Here is one I use for spaghetti sauce.
Ingredients:
- 4 onions, chopped
 
- 2 Tbsp. dried basil 
 
- 4 minced garlic cloves 
 
- 2 chopped, seeded bell peppers       
 
- 1/2 cup olive oil 
 
- 16 cups (5 lbs.) chopped tomatoes
 
- 2 Tbsp. dried oregano
 
- 1/4 cup chopped parsley
 
- 1/4 cup white sugar
 
- 2 Tbsp. salt
 
- 3/4 tsp. black pepper
 
Directions:
Dump and stir!  I use a 6 quart pot.  Low for 7 1/2 hours. If it needs thickening, I add 1 small tomato paste towards the end.
Source: I found this at allrecipes.com and have played with the recipe several times, but this is the basic version that I love.
By ms. carmen