
Should this be plural: laurel leaves ?

Yes, right. But think of this: one who cooks such dish could use a single leaf to just impart a very mild flavor to it. In this case, it'd be singular. :)

Fine - but then it would be "a laurel leaf", wouldn't it? You are making my mouth water again.

They're usually called "bay leaves", not "laurel leaves", in the context of cooking, even though one of the plants from which they're picked is called the bay laurel.
https://en.wikipedia.org/wiki/Bay_leaf
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