Standing between two buildings on 127th Street, a group of campers on the cusp of adolescence mulled over a change in schedule. Normally, they would spend the morning planting and gardening as part of Harlem Grown, a youth development nonprofit that uses gardening and cooking to teach and empower children in Harlem.

But on this Friday, they would become amateur cartographers, mapping their local food landscape.

The 15 campers walked through their neighborhood, paper and pencils in hand. How many delis? (By some counts, 17, by others, 14.) Supermarkets? (Three.) Fast-food restaurants? (Twenty-two, they estimated, but lost count.)

As he looked for places offering affordable vegetables, Myles Bradumn, a 13-year-old camper, grew frustrated. “What about the delis?” he asked.

“Can you get vegetables at the deli?” said his counselor, Jarielle Isaac, 22.

“Sort of,” Myles replied.