en_tn_condensed/mrk/02/23.md

began picking heads of grain

The disciples were picking heads of grain to eat the kernels, or seeds, in them while they were walking. They were not harvesting the grain to take it home. Plucking grain in others' fields and eating it was not considered stealing. The question was whether it was lawful to do this on the Sabbath.

heads of grain

The "heads" are the topmost part of the wheat plant, which is a kind of tall grass. The heads hold the mature grain or seeds of the plant.

as they made their way

"as they walked along"