柚子 is yuzu (and also refers to pomelo, a fruit which resembles a large grapefruit), and 茶 is tea, so 柚子茶 is yuzu tea.
About This Dish
A traditional Korean herbal tea made from sugar, honey and the Japanese fruit yuzu, known as yuja tea (the Japanese yuzu and Korean yuja derive from the Chinese 柚子 yáu jí). Can be served hot or cold.