Ingredients
- 1 clove garlic
- 3 tablespoons balsamic vinegar
- 2 tablespoons olive oil
- 2 teaspoons low-sodium soy sauce or tamari
- 1/2 teaspoon Dijon mustard
- 1/8 teaspoon freshly ground black pepper
- 4 portobello mushrooms (about 6 ounces each)
- Vegetable oil, for the grill grates
- 1 sprig fresh basil
- Red pepper flakes, for serving (optional)
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