1. Dehydrated Onions I seen the White castle staff empting a huge bag of dried onions the last time I went thru the drive -thru
2. I read that some sources suggest you spin the hamburger (cheap, tube variety, lots of fat) in a food processer to to a mussy fine grind
Another souce suggested you also thin the hamburger with "Strained Veal" (Gerber Baby food) to create even more paste-like texture. (YUM)
Roll out with a rolling pin between Wax paper or Plastic wrap ... I have attempted the holes with the ends of a chop stick, but never got it,
I used a electric skillet with a bed of re-hydrated onions, my atempts to roll hamburger to 1/8 of an inch, I in the mid-west, we can
get Soft Dinner rolls, which are probably Potato(e) based from GFS, right size for this project ...
But the reality is ... 0200AM in the morning, this is too much work for a product that is a 24/7 drive thru about 5 miles away
and you get a case of 30, with cheeze, which leaves ample left overs for breakfast