Jambalaya Recipe

1 tablespoon olive oil, or as needed

38 ounces andouille sausage, sliced

1 onion, chopped

2 1/2 cups water

2 (8 ounce) packagesjambalaya mix (such as Zatarain's®)

1 (10 ounce) can diced tomatoes with green chile peppers (such as RO*TEL®), drained