I've judged several barbecue contests and every one of them is double-blind: the contestants turn in their finished food to the organizers, who then assign a number to each contestant's plate. The contestants don't know what their number is and we (judges) are never told anyone's name. When the judges are finished scoring and burping, then the organizers average the scores for each number, then work backwards to see which contestant is the winner.
It's a simple system and it works.

Yep! And it looks like step 1 in the battery-changing manual will be:
"Cut open your hand."
Why didn't they think to put a rechargeable battery with induction charger, like what my electric toothbrush has?

My parents' church (no, actually, it's God's church but my parents attend there) runs a food bank for the neighborhood and they sometimes get useless stuff like:
- one giant bag of shredded lettuce;
- a big case of parsley;
- a big bag of Starbucks unground coffee beans;
- a case of those little Keurig flavored coffees (not many homeless people have Keurig coffee machines).

The bulk perishables tend to go bad before they can be broken into non-restaurant sizes and distributed to people.