1) Heat oil in a large sauté pan and sauté Onion until translucent. 2) Add garlic and tomatoes and continue to simmer until most of the liquid has been absorbed. 3) Add spices, potatoes and broth. Simmer for 10 minutes. 4) Add fish and continue to cook until the fish flakes. 5) Purée soup in blender or food processor. Return to stove and simmer over low heat for an additional 10 minutes.