slice in

slice in(to something)

to cut into something, usually with a knife or something similar. Betty sliced into the cake and discovered it was chocolate all the way through. It wasn't until she sliced in that she found out what kind of cake it was.
See also: slice
References in classic literature ?
It was a substantial meal; for, over and above the ordinary tea equipage, the board creaked beneath the weight of a jolly round of beef, a ham of the first magnitude, and sundry towers of buttered Yorkshire cake, piled slice upon slice in most alluring order.
To serve, set a Vidalia onion slice in the center of a plate and place a sturgeon fillet on top and sprinkle with salt and pepper.