Hasselback squash is a vegetarian option that can be a star dish at dinner parties. It is inspired by Hasselback potatoes and involves slicing the squash and filling it with seasonings. In this recipe, it is paired with a sweet and spicy agrodolce sauce. The steps to prepare the squash involve preheating the oven, cutting and peeling the squash, roasting it, and making the sauce. To slice the squash without cutting all the way through, you can use chopsticks or wooden spoons as a guide. As for the sauce, if you don't have moscato, you can use substitutes like white balsamic vinegar or apple cider vinegar.