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I was stationed at Bitburg Air Base in Germany during my stint in the Air Force.
I have a friend, now retired, who was also stationed in Germany about 40 years ago.

He tells of the tin army mugs they used and how they used to fabricate a makeshift clamp to hold an electrode centrally. They then used a clip lead to ground the mug to a nearby pipe or radiator and shoved the wire from the center electrode into the hot side of a convenient outlet.

Apparently they used a similar technique to cook steak between two metal oven grills! [Linked Image]