In a large soup pot, heat 1 tbsp of coconut oil (or olive oil) over medium heat. Add the onions, bell pepper and celery and saute until softened, about 7 minutes. Add the garlic and saute for 30 seconds more. Stir in the cajun seasoning. Add the vegetable stock, sausage, zucchini and beans to the pot and stir. Let simmer for 10 minutes. Check the seasonings, adjust if necessary, then serve.