Portobello mushrooms have a firm texture and virtually no fat or sodium.
In a small bowl, whisk together the balsamic vinegar, pineapple juice and ginger.
Place the mushrooms in a glass dish, stemless side up. Drizzle the marinade over the mushrooms. Cover and marinate in the refrigerator for about 1 hour, turning mushrooms once.
Prepare a hot fire in a charcoal grill or heat a gas grill or broiler. Away from the heat source, lightly coat the grill rack or broiler pan with cooking spray. Position the cooking rack 4 to 6 inches from the heat source.
Grill or broil the mushrooms on medium heat, turning often, until tender, about 5 minutes on each side. Baste with marinade to keep from drying out.
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