I'VE GOT IT!
OMG! CONDIMENT KING! Only, since the Riddler has reformed into Eddie Nygma, PI, Condiment King has decided to incorporate his methods. So he leaves Batman & Friends these mysterious clues that all pertain to recipes, his favourite foods, etc. And of course, Bruce is useless at cooking, so he calls Alfred
Alfred deciphers the Condiment King's clues to find out where his hideout is, but when Batman goes there, he is challenged to a COOK-OFF... OF DOOM!
Robin tries to give Batman tips, but he just cannot match the Condiment King's skill level, so Batman fakes a repetitive strain injury that prevents him from doing any cooking (he has a doctor's note from Leslie and everything!), so the Condiment King lets him pick a replacement competitor.
Enter Alfred Pennyworth: Master chef! Alfred PWNS the Condiment King at the cook-off, so the latter gets pissed and comes at him with a carving knife. Batman and Robin leap to Alfred's defense--but Alfred is quick with the pepper shaker and WHAM! Condiment King is temporarily blinded.
Batman and Robin bat-cuff Condiment King and call the cops. Gordon et all show up, and everyone has a nice picnic, eating the finished products of the cook-off.