Nǎiyóu Bōluó Bāo (奶油菠萝包)
The bo lo yau has no pineapple in it, only a crackled sugar crust that looks like one. A warm Hong Kong sweet bun split around a thick cold slab of butter, with milk tea.
Pineapple Bun
Bōluó Yóu (菠萝油)
Pineapple bun with butter; hot pineapple bun with thick cold butter slab inside. Hong Kong cha chaan teng classic.
Bōluó Bāo (菠萝包)
Pineapple bun; sweet bun with crispy sugary top (no actual pineapple). Often split and filled with butter.