While its name suggests that it’s a diminutive form of a common vegetable, broccolini is a hybrid of broccoli and the Chinese vegetable gai lan. With longer stalks and smaller florets, broccolini takes a more delicate shape on the dinner plate than broccoli, yet has a robust flavor that stands up well to a sweet and sour sauce with a bit of spiciness. On its own, this recipe makes a hearty vegetarian dish, and when served as a side, it never seems like an afterthought. In place of the refined sugar and ketchup that often make their way into sweet and sour sauce, I rely on honey, tamarind, tomato paste,…