Traditional Hong Kong 鷄蛋仔 (gai daan jai/ egg waffle) where every pocket of batter is plumped up with the most velvety mashed purple sweet potato ever. It's fragrant, plush, and not excessively sweet, which I love.

This egglette kiosk is recommended by the Hong Kong Michelin guide, so expect a 10-minute wait. It's worth it, though!