Either pickled or cooked (6)
I believe the answer is:
stewed
This clue could be a double definition.
'either pickled' is the first definition.
'stewed' can be an answer for 'pickled' (thesaurus). I'm not certain of the 'either' bit.
'cooked' is the second definition.
(stewing is a kind of cooking)
'or' is the link.
Can you help me to learn more?
(Other definitions for stewed that I've seen before include "(Meat) simmered; (tea) over-infused" , "Of tea, infused too long" , "mortal" , "Was long embarrassed" , "Cooked slowly" .)