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1 tablespoon Dijon mustard |
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2 cloves garlic, finely chopped |
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Pinch of red chile flakes |
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1 tablespoon finely chopped fresh thyme leaves |
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2 tablespoons finely chopped fresh flat-leaf parsley leaves |
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Kosher salt and freshly ground black pepper |
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8 medium portobello mushrooms, stems removed |
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