Whisk together mustard, Worcestershire, soy sauce, corn flour, tomato paste and water in a mixing bowl and set aside. Heat 2 tablespoons of water (per serve) in a large fry pan, add sausages and poach evenly on all sides for about 5 minutes, until just cooked.
Add 1/2 cup water and simmer on low with the lid on for 12 minutes. If you don’t have a cast-iron, any other skillet will do. Step 2: Lay your sausages in a greased 9″ x 13″ casserole dish. Step 3: Pour 24 oz. marinara sauce over top of your sausages. (see my favorite keto tomato sauces below!)
Cook sausages, about 15 minutes, until well browned and cooked through. Drain fat, and return skillet and sausages to medium heat. Stir in water, soy sauce, Worcestershire sauce, mustard, cayenne, tomato paste, and brown sugar. Bring contents to a boil; reduce heat, and simmer, stirring occasionally, about 10 minutes.
Cornflour: Also known as cornstarch, it thickens the sauce during the cooking process. Devilled sausages are the perfect family meal. Ideally, serve devilled sausages with something that will mop up all the tasty sauce. You could also serve with a side salad, but make sure you have lots of fresh crusty bread on hand to do the sauce mopping.