Shiitake mushrooms
Fresh shiitake are sold in many supermarkets, and dried ones, often even better for broths and braises, are in any Asian grocery.
Caution: Eaten raw or barely cooked, shiitake can cause an itchy, streak-like skin rash in some people, so they should be cooked through.
Fresh shiitake are sold in many supermarkets, and dried ones, often even better for broths and braises, are in any Asian grocery.
Substitute:
Fresh shiitake can be replaced with cremini or king oyster mushrooms, which are milder and less savoury; nothing quite matches the deep umami of dried shiitake in broths, and dried porcini come closest but taste distinctly different.