uncountable noun

[*^^*]

If eggplants, tomatoes and potatoes are all sliced into pieces, should we consider them uncountable nouns?
e.g.
I'd like some eggplant for lunch.(I know this one for sure. but not sure about the following two vegetables.)
I'd like some tomato for lunch.( not tomatoes?)
I'd like some potato for lunch. (not potatoes? )

 

[5jj]

All three are slightly unnatural, as they suggest that we'd like just one vegetable/salad item for lunch. We are more likely to say, "I'd like some X with my lunch".

1. Aubergine (BrE)/eggplant (AmE) is normally non-count, because we do not normally see the whole vegetable on our plate.
2. We could express our wish for a tomato (probably large), some tomatoes (probably small), tomato/some tomato (probably sliced). It depends on how we visualise the food at the moment of speaking.
3. Similarly, we might want a potato (probably baked), some potatoes (probably boiled), potato/some potato (probably mashed), chips/some chips (BrE), fries/some fries (Ame E)