The “salad-as-star” trend is a welcome one, and purveyor Sweetgreen has taken Boston’s lunch crowds by storm with its healthy and hearty salads and grain bowls. Dishes are made to order and tossed in a big mixing bowl, making the resulting salad easy to dig right into. Kale Caesar salad and the Harvest Bowl—with kale, apples, sweet potatoes, roasted chicken, goat cheese, and toasted almonds—are popular standbys.