This is bad English, though. That is what led me to think it was a plural form of lemon, although yes, I hadn't learned the plural form. But in English we'd definitely either add an indefinite article or type 'lemons.'
I disagree. A recipe with "lemons" would have multiple lemons involved, probably whole or sliced. A recipe whee " lemon" could just have juice or zest or something.
The more common translation is "recipe", and makes more sense in this context (food).