- 3 Continue to cook the mushrooms while stirring them for about five minutes, or until most of the moisture has evaporated. Add three teaspoons of the olive oil, the chopped porcinis, the minced garlic, and the thyme. Continue to cook for a few minutes, until you can smell the garlic. Add the red wine and pepper, and cook, stirring, for a short time, or until the wine has been absorbed. Remove from heat and mix with the potatoes. Arrange the mixture in the gratin dish. Measure out three cups of the liquid reserved from soaking the porcinis and pour it over the mushroom and potato mixture.
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