Gat Butter Donuts is a takeout shop near Yi Sun-sin Square in Yeosu that sells buttercream donuts made with gat, a local Yeosu specialty. The donuts are kneaded and fermented each morning, fried, then filled with buttercream made from ground gat. Donuts are sold only in boxes of seven, not individually. The packaging box is neat, which makes it suitable for gifts.