Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   6      whole         portabella mushrooms -- - cleaned, stems
                        rem
                        ***VINAIGRETTE***
     1/4  cup           vinegar
     3/4  cup           olive oil
   1      teaspoon      sugar
   1      teaspoon      salt
     1/4  teaspoon      freshly ground black pepper
   1      tablespoon    balsamic vinegar
   2      teaspoons     lemon juice

Preparation:

Prepare vinaigrette: Combine all vinaigrette ingredients in a lidded jar. Shake well just before using. Lay clean mushrooms in a shallow baking dish and pour 1/2 cup of vinaigrette over it. Cover and marinate for up to 24 hours, turning the mushrooms once. When ready to cook, drain dressing; reserve for another purpose. TO GRILL: Place on grill over warm coals for 5 to 10 minutes, turning once. TO BROIL: Place on a baking sheet and set under broiler for 5 to 8 minutes. TO BAKE: Place baking dish in preheated 425 F oven for about 15 minutes. NOTE: You may substitute sliced portabellas. However, you may need to grill them on a piece of foil to avoid breakage. Poke holes in the foil to assure a good smoky flavor.