Piece or slice is fine, you just want some meat.
A slice means it's neatly and finely cut. A piece could also mean this, but you could also receive a chunk of meat.
2 มิถุนายน 2010
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both sentences are okay yet, "May I have a slice of your meat?" is more conventional.
:)
2 มิถุนายน 2010
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"May I have a piece of your meat" or "May I have a slice of your meat"
Both are fine but just take note of the spelling :D
"piece" is different from "peace".