Kasutera is a moist, springy sponge cake made from eggs, sugar, flour, and malt syrup, known for its fine crumb and deep amber top. Brought to Japan by Portuguese traders in the 16th century and perfected in Nagasaki, it balances simple sweetness with the elegance of a well-made sponge. Each slice is tender, fragrant, and subtly caramelized, often enjoyed with tea or given as a symbolic gift of prosperity and hospitality.