Multicooker Directions: In Step 1, stir together the stock, water, sweet potato, carrots, russet potato, lentils, onions, celery, garlic, thyme sprigs, bay leaf, salt, and pepper in the inner pot of a 6-quart multicooker. Lock the lid; turn Pressure Valve to "Venting." Cook on SLOW COOK [Normal] until the vegetables and lentils are tender, about 8 hours. Remove and discard the thyme sprigs and bay leaf. Turn off the cooker. Complete Step 2.