Sauté the onions and garlic in the olive oil until they begin to turn brown and caramelize. Remove from heat. In a large slow cooker (where I’m from we call ’em crock pots—but that kind of sounds less appetizing, right?), combine the cooked onions and garlic, chopped carrot, chopped potatoes, split peas, lentils, bay leaf, oregano, cayenne and 7 cups of vegetable stock.