How do you say "one thing" in Japanese?
I mean "one thing" as in "I only wanted to eat this one thing off of the plate"

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Answer

one thing
ひとつ one(thing)／ひとつのものone thing(concrete)／ひとつのことone thing(abstract)

this one thing
これthis(thing)／これひとつthis one(thing)
I only wanted to eat this one thing.
わたしは　これ（ひとつ）だけが／を　たべたかった（です）。