The syrup is an easily made reduction of mushroom stock, and it can be used in the next recipe as well. Serve this with simply roasted or grilled meat.
Preheat the broiler or prepare a grill. Put half the butter and 1tablespoon oil in a skillet and turn the heat to medium-high. When the butter melts, add the button mushrooms, shallots, chopped garlic, and salt and pepper to taste and stir. Cook, stirring occasionally, until th