IT'S ABOUT FAST-FOOD

Hi, could someone explain to me this paragraph from Steinbeck's "Travels with Charley" when he's talking about fast-food or food of complete sameness:
:
'Just for ducks, let's try a little of what my boys would call this GENERALITY JAZZ. UNDER HEADS AND SUBHEADS. LET'S TAKE FOOD AS WE HAVE FOUND IT.'

Thanks in advance, Jo.