INGREDIENTS
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1 pound(1/2 kg) cremini mushrooms, halved
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1 tablespoon extra-virgin olive oil
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1 large sweet onion, diced
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1 3/4 cups (~415 ml) light beer (drink what’s left in the bottle)
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Kosher salt
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1/3 cup (76 g) finely chopped walnuts
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1 small green bell pepper, seeded and diced
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Freshly ground black pepper
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1/2 teaspoon chipotle chile powder
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1/4 cup (60 ml)ketchup
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3 tablespoons tomato paste
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6 whole grain vegan hamburger buns
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Shredded red cabbage or lettuce, pickled jalapeno and scallions, for serving, optional