4 portobello mushrooms (about 1 1/2 pounds), stems removed, dark underside of caps scraped off |
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1/3 cup plus 6 tablespoons olive oil |
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1 1/4 teaspoons dried thyme |
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1/2 teaspoon fresh-ground black pepper |
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1 pound boiling potatos (about 3), peeled and cut into 3/4-inch dice |
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1 1/2 tablespoons Dijon mustard |
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4 scallions including green tops, chopped |
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