This is a Cajun gumbo, so it does not contain any tomatoes. The roux is what thickens the gumbo and gives it a deeper flavor. Butternut squash isn’t a traditional ingredient, but I think it works well. I used my homemade vegan andouille sausage recipe from my book, The Ultimate Vegan Cookbook for Your Instant Pot[/i], but you can sub your favorite store-bought sausage