How to Make It
Combine first 4 ingredients and 1/2 cup parsley in a large zip-top plastic bag. Add portobello mushroom caps to soy sauce mixture; let stand 1 hour, turning bag occasionally.
Heat a cast-iron skillet over medium-high heat. Add oil and button mushrooms to pan; cook 4 minutes or until mushrooms are tender. Stir in garlic powder, onion powder, and black pepper; cook 1 minute. Transfer button mushroom mixture to a medium bowl.
Heat a grill or grill pan over medium-high heat. Remove portobello mushrooms from marinade; discard marinade. Add portobello mushrooms to grill or grill pan. Cook 3 minutes on each side or until slightly tender; cool. Chop mushrooms. Add portobello mushrooms to button mushroom mixture; toss to coat. Stir in remaining 1/2 cup parsley.
Passion Fish, Reston, VA, and Bethesda, MD