San choi bao is a popular dish at the Lunar New Year, although it can be eaten at any time. Normally, the "lettuce cups" are filled with a meaty mixture that can include pork, quail, or pigeon, but in this version, all the ingredients are plant-based. Like the meaty versions, this filling is a good mix of colours, flavours and textures, and the lettuce cups add a cool, delicate crispness. This is a dish that invites improvisation. If you can't find some of the ingredients listed in the recipe,...