In a big pot place the following:
chopped: carrots, potatoes, celery, mushroom, and onions and a handful of rice. Cover with water. Add a tablespoon or two or minced garlic. Add a bit of salt and pepper. Cook for 20 minutes. Add a can of diced tomatoes (14..5 oz) and finish cooking until veggies are the way you like them and the rice is done.
I used about 3-4 carrots and 4 potatoes, around 2 large celery and 1 large onion, and 3-4 mushrooms. You can add as much or as little as you want. (I used organic tomatoes)