Heat olive oil in a large saucepan over medium-high heat.Add onion, bell pepper, and garlic to pan and sauté for three minutes.Stir in water, garlic, puree, chili, cumin, three tins of beans and tomatoes.Bring to a boil then reduce heat and simmer for 15 minutes Stir in cornmeal and cook for two minutes Remove from heat and stir in coriander Serve with Greek yogurt.