Combine all ingredients (except corn starch) in a casserole
bring to boil
make slurry (while waiting for ingredients. To boil)
combine the buko juice (you can also use water) and cornstarch then whisk until the cornstarch is diluted.
pour the slurry mixture in the casserole and stir thoroughly.
allow to cook while stirring until the mixture reaches your desired thickness
pour the mixture in a tray then flatten the top using spatula
garnish with toasted sweetened grated coconut or nuts
allow to cool down then refrigerate.