berry closeup farm fruit green herb leaves macro medicinal mucolytic agent plant Sapindus saponins soapberry Soapnut surfactant tree yield Australia black-seed brittle cluster-growth dimocarpus-longan dragon-eye-fruit edible flavor flavour flesh food fresh healthy husk juicy leathery-skin light-brown-shell longan lungan produce sapindaceae shell short-fresh-life soapberry-family soft South-East-Asia surface surfaces sweet tactile tasty texture textures translucent-flesh tree-fruit tropical