Buko Pie Trivia. Buko pie is a traditional Filipino baked young-coconut (malauhog) custard pie. It has proven to be a popular dish for Filipinos. It is almost like a coconut cream pie, only it is made with young coconuts (buko in Tagalog), has neither cream in the coconut custard filling or meringue swirls on top of the baked coconut custard. Instead, the pie utilizes sweetened condensed milk, making it denser and heartier.