Step 1
In a large bowl, whisk together balsamic vinegar, soy sauce, garlic, and pepper. Add mushrooms and marinate 20 minutes. Presoak wooden skewers in water while mushrooms marinate.
Step 2
Heat grill to medium-high. Skewer mushrooms and grill 2 to 3 minutes per side. 
Step 3
Garnish with parsley before serving.
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