Regarding all of these, the Kohanim may vary the [manner of] their consumption, to eat them roasted, overcooked, or cooked, and to add to them non-sacred spices and spices of terumah; [these are] the words of R’ Shimon. R’ Meir says: One may not add spices of terumah to them, so that he not expose the terumah to disqualification.