To help combat cabin fever and the cold, I surveyed my colleagues about their favorite winter soup recipes. Heat the olive oil in a large pot or Dutch oven over medium heat and add the onion, carrots, celery, kale stems and cumin. Heat a large soup pot (5 1/2 quart or larger) over medium/high heat and add 2 tablespoons of olive oil. Add chopped onions, celery and bell peppers. But when I am feeling inspired, my go-to winter crockpot special is The Joy of Cooking's pasta e fagioli soup.