You'll encounter these tetrahedral leaf wrapped things every so often. Called zongzi, I've heard them referred to as Chinese tamales. Usually the binding matrix is glutinous rice, and come in savory and sweet versions, as well sizes ranging from the size and heft of a baseball to this one, which is only a couple of inches across.
Inside, this zongzi is emerald green, fragrant with the scent of steamed bamboo leaves, chewy, sticky, subtly sweet. It carried a small payload of mashed beans, and is the perfect foil for a cup of tea.