Red slice on a burger (6)

I believe the answer is:

tomato

(Other definitions for tomato that I've seen before include "It used to be call a love-apple" , "that's suitable to eat" , "Love apple (or "beef" fruit?)" , ""Plum" or "beef" fruit?" , "Pulpy edible fruit" .)

I've seen this clue in the Newsday.

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