Sausage 1 tablespoon vegetable oil 1 ring (13.5 ounces) andouille sausage, sliced into ¼-inch rounds Vegetables 1 large onion, diced (about 1 cup) ½ cup diced celery, about 1 rib ½ red bell pepper, seeded, diced 2 teaspoons garlic, minced Soup 1 teaspoon Cajun seasoning ½ teaspoon kosher salt ½ teaspoon black pepper ½ teaspoon…