Porcini Powder, Butter, and Salt

I use Boletus rubriceps, for this recipe, but B. edulis, B. aereus, B. pinophilus, or B. reticulatus or any combination of these will do. Porcini powder is a great condiment to have on hand, and I use it in lots of ways. One of my favorites is as a rub on meat. Beef rubbed with the powder, seared, and cooked in a pot roast is fabulous. You can also make Porcini Butter using this recipe, which Daniel Winkler—an expert on Ophiocordyceps sinensis—taugh