Wash, core, and roughly chop tomatoes
Add tomatoes, onions, carrots, and garlic into a large stock pot.
Heat slowly over low heat.
When all ingredients are soft and cooked through, approximately 1 hour, remove from heat
Process tomato mixture in a food processor for approximately 30 seconds. You will need to do this in small batches.
Placed pureed tomatoes into a food mill or a food strainer to separate seeds, pulp and sauce.
Return sauce to pan.
Add chicken broth, salt and pepper and brown sugar and bay leaf
Continue cooking for about one hour allowing soup to reduce.
Remove bay leaf before serving