If your Svc Bn has a mobile kitchen and a qualified Sgt Cook (qualified, but possible at MCpl rank), then the kitchen could be set up on weekend to provide a meal to your unit and/or other units who are working that weekend. A Sgt Cook is required to order fresh rations and supervise.
The balance of the time would be utilized to get more experience on all aspects of the mobile kitchen to fill in the gaps from the short time spent on the eqpt on crse. Preventive maintenance incl.
Otherwise you will be doing the same soldier training that all trades in the Svc Bn are doing such as wpns training (indoor shooting simulator), refresher trg of all soldier skills, prep for FTX (Field Training Exercise), post FTX clean up, etc. Learning to drive a military veh, backing the kitchen trailer, positioning, etc.
Others here will add info. DAP should be able to cfm if the first para is still current info.