Step 1 In a blender, puree the tomatoes, onion and garlic to a smooth sauce. Place the oil in a large saucepan and add the tomato mixture. Cook about 5 minutes, until the sauce has reduced somewhat.
Step 2 Add the chicken broth and bring to a boil. Simmer for 10 to 15 minutes. Add the epazote during the last minute of cooking. Adjust the seasoning.