The Hasselback technique creates greater surface area for flavorful herbs, seasonings, and butter—and lots of it—to cling to. The result? Delicious flavor  and texture in every bite. To achieve the hallmark thin slices of Hasselback dishes, we used a two-step roasting process. By roasting the unsliced squash halves until slightly softened, we were able to cut consistent, thin slits with ease.