It gives the fighters a little extra energy out on the field. I'm a firm believer that if you have a properly equiped kitchen, you can do anything you can do at home. Only difference is the amount of prep. You don't have to worry about extra dirt getting in the food. Darn wind can get through the best kitchen tent and I prefer cooking in the open.
Proper sizes fit easily into ice chest or storage boxes.
You name it, it can be done. If you want to cheat, you can have a cooking party the night before the event and just heat it up when you get there. So long as you have good presentation and flair, who's to know you didn't cook it there. Have a plan and stick to it. Have a plan and stick to it.