この店のカレーも美味しくないことはないが、私はもっと辛いのが好きだ。
I know there are many uses of も, to mean 'even', 'also', 'not even', etc. What would be its use in this sentence above?
It's not like I EVEN like the taste of the curry in this shop, I prefer more spicy curry instead
The even in the sentence does not make sense, hence what is the correct meaning of the も?
This is similar to kandyman's answer, but hopefully somewhat helpful.
First ないことはない is a double negation, so the sentence means the same if dropped:
So the speaker compares two curries, the shop's and the spicier, and prefers the latter. But the speaker thinks both are good, hence using も meaning also.
A possible difficulty is that this also may not really be idiomatic, I guess a more proper translation would be without it: This shop's curry is ok...
To be more precise, as given in the links in the comment, this も is used to weaken the statement/express reservation on the statement, which is also the function of the double negation. As such この店のカレーも美味しくないことはない can be thought of この店のカレーはおいしい being wrapped with many maybe's.
I think in any case this weakening sense of も derives from also.
Examples for も in the 強く否定する context. They are usually translated as at all or even.
The translation of the sentence does not seem quite accurate. ～ことはない is usually used to express the negation of possibility of something (or lack of necessity of something). In this case, the possibility of 美味しくない is being negated. Also, the も is the standard usage of も to indicate 'also'. In other words, the writer is saying that the curry, as well as other items in the shop, is good but that they would prefer it to be hotter.
この店のカレーも美味しくないことはないが、私はもっと辛いのが好きだ。
It's not that the curry in this shop isn't also good, but I like spicier (curry).
