Puso ng Saging (Tagalog) literally means heart of banana, because it is red and it sort of heart-shaped. It's actually the banana infloresence from where (probably) the banana fruit comes from. The bloom "puso" itself when sliced thinly crosswise is the main ingredient of "ginataang puso ng saging" (Tagalog) or "linabog" or "labog" (Aklanon). It is nothing but the puso cooked in coconut milk.