@Khandro
It does say cups!
Also, the quantity per layer is "tbsp" - tablespoons.
"First place few lime pieces in a single layer and spread 1-1½ tbsp of salt on top. Continue to layer lime pieces and top them with salt until you exhaust all the limes."
Try doing your own g/100g calculation, like they do for food labelling… gulp!
Beware US recipes. Their gallon is different, so their quarts, pints and fluid ounces must be different too.
I'll bet US cup is a different number of mls than EU standard, too.