Grilled Sirloin with Shallot Soy Sauce

In a small saucepan, combine the soy sauce with the rice vinegar, garlic, shallots, honey and black peppercorns and simmer over moderate heat until the sauce is reduced by one-third, about 15 minutes. Remove the pan from the heat and let the sauce cool to room temperature, then cover and refrigerate it overnight.

Strain the sauce into another small saucepan and add the lime juice, 4 tablespoons of the butter and 1 teaspoon of ground pepper. Simmer the sauce over moderate heat for 2 minutes, then remove the pan from the heat and keep the sauce warm.

In a large skillet, melt the remaining 2 tablespoons of butter over moderately high heat. When the foam subsides, add the mushrooms and ginger and cook, stirring occasionally, until the mushrooms are browned and almost tender, about 10 minutes. Remove the skillet from the heat, stir in the chives and season with salt and pepper.

Season the steaks with salt and pepper. Heat the oil in another large skillet. Add the steaks and cook over high heat until browned, about 2 minutes per side for medium-rare meat. Spoon 2 tablespoons of sauce onto each of 4 plates, set a steak on top and cover with the mushrooms. Pass the remaining sauce at the table.