Technologies are generally described for en route food product preparation. Food product preparation process steps and timing may be determined based on travel information (e.g., starting point, intermediate waypoints, delivery destination, routes, etc.), as well as, food item and food product information. Instructions for robotic devices arranged modularly in a container or truck to execute steps of the food product preparation process and their timing may be transmitted to a controller managing the operations of the robotic devices. Instructions may be updated en route based on changing travel or other conditions.