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1 3/4 cups light beer (drink what's left in the bottle)
1/3 cup finely chopped walnuts
1 small green bell pepper, seeded and diced
Freshly ground black pepper
1/2 teaspoon chipotle chile powder
1/4 cup ketchup
3 tablespoons tomato paste
6 whole grain hamburger buns
Shredded red cabbage or lettuce, pickled jalapeno and scallions, for serving, optional
Pulse the mushrooms in batches in a food processor until finely chopped. Set aside.
Heat the oil in a large nonstick skillet over medium-high heat. Add the onions, 1 tablespoon beer and 1/4 teaspoon salt and cook, stirring frequently, until the onions are lightly browned, about 5 minutes. Add the walnuts and peppers and cook, stirring occasionally, until the peppers are crisp-tender, about 3 minutes. Add the mushrooms, 3/4 teaspoon black pepper and chipotle powder and cook, stirring frequently, until the mushrooms are just cooked through, about 5 minutes.
Add the remaining beer, the ketchup, tomato paste and 1/8 teaspoon salt and cook while stirring until the sauce is the consistency that you like, about 2 minutes.
Spoon the mixture onto each bun. Serve with toppings if desired.