Cucumber has become what I associate with summertime in Beijing. During these oppressively hot months, you’ll often see street vendors selling not popsicles (ok, you can find those too) but, yes, cucumbers — on a stick! Last summer, when Becca visited and we went to the Summer Palace, we came across just these cucumber street vendors and couldn’t resist giving it a try. For a couple kuai you can have the cucumbers peeled and attached …