Box of Chocolates
From the Super Mario Wiki
The Box of Chocolates is an item that appears exclusively in the Game Boy Advance remake of Donkey Kong Country 3: Dixie Kong's Double Trouble! Dixie or Kiddy Kong require it to complete a trade.
Bachelor will tell the Kongs that he needs some chocolates and a Rose to take on his hot date. The Kongs can purchase the Box of Chocolates from Bazaar for twenty Bear Coins, and then give it to Bachelor. Once Bachelor receives both the Box of Chocolates and the Rose, he will reward the Kongs with a Banana Bird.