[dnemmers]

“The final rolling is therefore done on a sandwich of two sheets, face to face.”

[slau]

Whomever wrote that clearly has never made or eaten a sandwich. Without something in between the two layers, it’s hardly a sandwich.

[mjevans]

The foil is the 'meat' the rollers are the bread.

[jgwil2]

*Whoever wrote that. The person who wrote is the subject of that phrase, not the object.

[qingcharles]

To quote the Blues Brothers, that's a "wish sandwich", when you have two slices of bread and you wish you had some meat.

[perilunar]

An open sandwich can have two layers.

[AnthonBerg]

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