INGREDIENTS
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1 cup walnuts
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2 tbsp + 2 tbsp olive oil, divided
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1 1/2 tbsp minced shallot (about half one medium)
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2 cloves garlic, minced
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1 lb cremini (or other) mushrooms
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2 oz blue cheese, crumbled (plus more for topping)
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1/4 cup chopped fresh parsley
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1 1/2 cups fresh breadcrumbs
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1 tbsp lemon juice
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salt & pepper
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1 egg
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4 hamburger buns
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mayonnaise, for topping
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arugula, for topping