expression, noun which may take the genitive case particle 'no'
for connoisseurs; preferred by experts
Describes something that appeals to people with refined taste or deep knowledge in a particular field, rather than to the general public.
See also: 通
この店は通好みの品揃えで知られている。
This shop is known for its selection of items that appeal to connoisseurs.
彼の選ぶワインはいつも通好みだ。
The wines he chooses are always ones that experts appreciate.
通 is a noun meaning 'connoisseur' or 'expert'; 通好み is a compound expression meaning 'to the taste of a connoisseur'.
Compound of 通 (つう, 'connoisseur') and 好み (ごのみ, 'liking, taste').