1In a large pot or Dutch oven over medium heat, heat olive oil. Cook onion, carrot, celery and garlic until onion is translucent. Stir in yellow and green split peas, broth, seasoning and salt. Cover, bring to a boil, then reduce heat and simmer 2 1/2 hours, stirring frequently. Puree with a blender or food processor. Return to pot, heat through, and serve.