Real Italian Tomato Sauce - cooking recipe

Ingredients

1 Tbsp. olive oil
1 medium onion, cut in chunks
8 oz. fresh mushrooms, sliced
1 to 3 Tbsp. dried basil (3 times more if fresh)
2 large cloves garlic, crushed or minced
1 large bay leaf
1 (28 oz.) can tomatoes
1 (10 3/4 oz.) can tomato puree
1 (6 oz.) can tomato paste
salt and fresh ground black pepper to taste

Preparation

Heat a large kettle over medium heat.
Put in the oil, onion, mushrooms, basil and garlic.
Cover and reduce the heat to medium-low.
Stir frequently; you may need to add a tablespoon or two of water to keep it from sticking.
When the onions are translucent, add the remaining ingredients, except the salt and pepper.
Bring to a boil on high heat; then reduce to simmer and let cook for an hour or so, stirring occasionally and breaking up the whole tomatoes.
Add salt and pepper to taste.