INGREDIENTS
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2 cups walnut halves
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8 ounces portobello mushrooms, gills removed, roughly chopped
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3 ounces chilled vegan butter, cubed
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2 cups cooked freekeh, bulgur, brown rice, or other grain
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1/2 cup uncooked regular rolled oats
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2 tablespoons grated red beet (grated using a Microplane grater)
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2 tablespoons vegan mayonnaise
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1 tablespoon soy sauce
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2 1/2 teaspoons kosher salt
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2 teaspoons black pepper
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4 garlic cloves, grated using a Microplane grater
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10 hamburger buns
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Hamburger toppings