From Pikipedia, the Pikmin wiki
The Gourmet Series (味皇帝シリーズ?, lit.: "Taste Emperor Series") is the fourth series numbered in the Treasure Hoard in Pikmin 2. It covers treasures 23 to 27. It consists of basic food related products that are considered classy to Hocotatians.
“You've collected the Gourmet Series! These classy flavors will delight the snootiest gourmand!”
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