Toward the end of the movie (33 minute to the end), they are showing and commenting about a fruit they call "kumquat" which is in fact a "Physalis" also called "Cape Gooseberry", a fruit originally from Chile and Peru. A Kumquat is like a miniature orange, which can be eaten whole, or used in making marmalade. It has a very sharp flavour. A physalis has a paper-like husk like a tomatillo and is very sweet when ripe.