If you know how to cut a Hasselback potato, then you can slice a Hasselback squash. And if not, don’t worry! The cutting technique for Hasselback squash is simple: Just think of an accordion. During baking, the final product will open up to look like an accordion. The process is easier than you think.
Just grab two wooden chopsticks, a sharp chef’s knife, and a cutting board. Place your peeled and par-baked squash half on a cutting board, cut side down. Place one chopstick on each side of the squash (the long way). Now, cut ¼-inch wide slices to create your accordion cut. As the knife blade goes through the squash to make a cut, the blade will stop when it meets the chopstick, ensuring that the cut does not go all the way through. Genius!