Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   4      medium        portabella mushrooms -- stems removed
                        olive oil -- as needed
                        salt -- to taste
                        freshly-ground black pepper -- to taste
                        ***gremolata***
   2      cups          hazelnuts -- coarsely chopped
   2                    garlic cloves -- finely chopped
     1/4  cup           finely-chopped parsley
   2      tablespoons   finely-chopped lemon zest
                        salt -- to taste
                        freshly-ground black pepper -- to taste

Preparation:

Brush mushrooms on both sides with olive oil and season with salt and pepper to taste. Grill for 5 to 6 minutes on each side until just cooked through. Serve each person a mushroom cap and sprinkle with the gremolata. For the gremolata, combine all ingredients in a medium bowl and season with salt and pepper to taste.