Versatile Spaghetti Sauce

• 2 garlic (cloves)
• 1 onion
• 1 zucchini
• 1 wheat spaghetti (whole)
• 1 wheat pizza crust (whole)
• 1/2 green bell pepper
• 650 gr tomatoes
• 85 gr mushrooms
• 50 gr celery
• 16 ml olive oil