There were heavy restrictions on the number of patrons at food vendors on the mountain, with many of them choosing not to open over the past ski season (we're in Australia). Additionally, ski school only ran a half program finishing at midday to avoid having all of the kids congregate in lunch rooms, consequently we had to get creative with feeding kids in the parking lot.
We found these 12v meal heaters to be excellent this past winter. $20 on Amazon.
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I ran them off a secondary 12v battery. They were switched on as we put our boots on and left the car in the morning, by lunchtime they were piping hot. I found some great pyrex containers with sealable lids with breather vents that fitted in the heater bags perfectly.
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Kids had warm lasagne, pasta, toasted sandwiches, risotto, cottage pie, soup, casserole and curries. Plenty of good food to recharge and keep them going for the day. Beeter than the nuggets and chips they are usually fed at ski school or the $100 ++ per day to feed everyone lunch on the mountian.
We even hunted down and old school folding picnic table and chairs:
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