Brown onions. Add minced garlic near end and brown slightly. Add tomato soup and one can of water. Add diced tomatoes. Drop in pickling spice tied in cheesecloth. Simmer for 1 hour. Meanwhile, brown meat in batches and add to onion mixture. Add remaining ingredients. Cook on very low heat until thick and flavors are blended or about 1/2 hour. Add oatmeal to thicken and continue simmering for 5 minutes. Remove from heat. If freezing, let mixture cool before putting in containers. Serve on toasted hamburger buns or kaiser rolls. Optional additions: Shredded cheddar cheese, sliced tomatoes.