Meanwhile, in a medium saucepan, heat 2 tablespoons of the olive oil. Add the shiitake and season with salt. Cover and cook over moderate heat, stirring, until the mushrooms are tender and starting to brown, 5 minutes. Add the remaining 1 tablespoon of olive oil along with the garlic, cumin, coriander, pepper and turmeric and cook, stirring, until fragrant, 1 minute. Add the greens and cook, stirring, until wilted, 2 minutes.