Translation:They do not like spicy eggplants.
In Indo, they dont use the word twice everytime they want to denote a plural. That would be way too repetitive and unnecessary if the context is known already. Usually they use the word twice if they need to emphasize its a plural and theres more than one.
This should say, "They do not like spicy eggplant". The plural and singular form of eggplant is 'eggplant'.