INGREDIENTS
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1 15-ounce can kidney beans, drained and rinsed
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1 small red onion, shredded and squeezed dry (about 1/2 cup)
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1/3 cup chopped walnuts
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1 small carrot, finely diced
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1 cup plain or whole-wheat breadcrumbs
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2 scallions, white and green parts, finely chopped
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2 tablespoons chopped fresh parsley
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2 teaspoons Worcestershire or soy sauce
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Kosher salt and freshly ground pepper
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3 tablespoons extra-virgin olive oil
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3 cups assorted mushrooms, sliced
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4 English muffins, split and toasted
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Mayonnaise and/or mustard, for garnish
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Baby spinach or arugula, for garnish