A cucumber left on the vine until its skin turns tough, dry and yellow-brown, with firm flesh. Halved, seeded and often left unpeeled, it is simmered with pork bones in Cantonese soups.
Old cucumber makes a particularly refreshing soup.
Tips
culture
Cucumber left to ripen until the skin yellows. Flesh is firm and slightly sweet; mostly used in Cantonese 老火汤 (slow-simmered soups) with pork ribs and dried dates.