10 extra lg. white mushrooms
1/3 c. olive oil
Juice from 1 or 2 lg. limes
Zest from 1/2 lime (grated rind)
1/2 c. fresh horseradish
1/2 tsp. dried parsley
Fresh ground black pepper--to taste

Cut stems from mushrooms so they will be flat on the grill. Wash and pat dry. Mix oil, juice, zest, horseradish, parsley and pepper.