Judging by the picture the slice is done in a spiral which results in two Mobius bagels

It's sliced along the center, rotating the axis of slice 360 degrees as it goes along the circle, cutting it in two halves which interlock

you could gentrify a neighborhood selling these hipster mobius bagels to couples.

There has been recognition of a particularly useful application of Möbius strips for a long time: belts in machinery wear out slower if they're Möbius strips, because that way the contact with the shafts is split between both sides of the belt. The oldest example of this usage I know of is from a 13th century engineer in the region of modern-day Iraq and Syria