Umami is the savory "fifth flavor" that excites our taste buds and heightens our enjoyment of food. It's found famously in roast meat and soy sauce, but also in mushrooms and garlic. You'll see what we mean when you take a bite into these amazingly savory mushrooms, which are also flavored with shallots, rosemary, thyme, and sweet red peppers. We suggest you serve these stuffed treats with truffle salt, another umami-rich ingredient, but you can also use a sprinkling of sea salt. Be sure to season the mushrooms while they're still warm for the ultimate umami bomb. And the best part is these stuffed mushrooms may be made ahead and rewarmed before serving.