Step 1

Coarsely shred the seitan using a box grater or the shred blade of a food processor.

Step 2

To make the sauce, stir the ketchup, mustard, Worcestershire sauce, brown sugar, apple cider vinegar, soy sauce, chili powder, and paprika together in a small bowl.

Step 3

Coat the bottom of a medium skillet with oil and place it over medium high heat.

Step 4

When the oil is hot, add the onion. Sauté the onion until softened and just beginning to brown, about 4 minutes.

Step 5

Add the garlic and sauté for about 1 minute more, until very fragrant.

Step 6

Add the seitan and continue to sauté for about 5 minutes more, until it begins to brown and crisp in spots.

Step 7

Stir in the sauce and 1/4 cup of water.

Step 8

Bring the sauce to a simmer and allow it to cook, stirring occasionally, for about 5 minutes. You can add more water if the sauce becomes too thick.

Step 9

Remove the skillet from heat and season with salt and pepper to taste.

Step 10

Stuff the seitan mixture into buns and top with toppings of choice. Serve.