hasselback

verb1

1. •
   To slice (usually a potato or other root vegetable) thinly while leaving the bottom intact.

   • Use a knife to cut halfway through the apple halves in thin parallel slices, so that they stay intact. This is hasselbacking. — 2016

noun[in the plural]1

1. •
   A single unit of potato or other root vegetable in the dish of Hasselback potatoes.