Did Zheng He's fleet include farming ships that grew tofu or other food during its voyages?
Short answer
The claim is possible but uncertain, and regular supply ships trading at friendly ports are considered more likely.
Notes
Farming ships remain an uncertain possibility. A more likely explanation is that supply vessels called at ports with which the fleet already had relationships. Gold could then be exchanged for provisions. Under that interpretation, the voyages depended on port replenishment and supply ships.