[Hoffman’s] charred eggplant dust is basically a Genie in a bottle: Stir it into a bit of olive oil and yogurt, and you’re suddenly tasting baba ganoush. That onion powder, made by slowly smoking yellow onions over applewood chips, is the building block of a perfect grill marinade. Stir the tarragon-caper dust into butter and rub on roast chicken, or add the shiitake powder to stock for an umami boost.