If it should go fast, the micro-heat pack "Mini" could help. Just put it in the microwave for about 3 minutes at max. 600W or about 2 minutes at max. 900 Watt and the heat pack is ready for use.
It consists of special PCM with high heat storage capacity and, depending on the ambient temperature, keeps the heat from approx. 60°C for up to 3 hours. In MINI format it fits perfectly into our CARRYBOX 12320 or into the MINI MENU boxes.