Finely chop or grind the seitan in a food processor until you have a well-formed mixture.
Finely chop the garlic and red onion.
Heat one tablespoon of olive oil in a skillet over medium heat. Sauté the onion and garlic for 3-4 minutes, until softened.
Add the chopped seitan to the skillet and season with soy sauce, smoked paprika, and black pepper. Cook for another 5 minutes.
Pour the seitan mixture into a bowl and let it cool for a few minutes.
Add breadcrumbs and a beaten egg, then mix thoroughly until you have a mixture that holds its shape.
With wet hands, form 4 patties. Place them on a tray and let them rest in the refrigerator for 20 minutes.
Heat one tablespoon of olive oil in a skillet over medium heat. Cook the seitan patties for 4-5 minutes on each side, until golden brown.
Toast the hamburger buns in a dry skillet or oven.
Assemble the burgers: place a lettuce leaf on the bottom half of the toasted bun, top with a seitan patty, a slice of tomato, then mustard and ketchup.
Place the top half of the bun on top and serve immediately with a fresh salad or fries.
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