You'll ride right by The Mill Creek Cattle Company on the 38 through Mentone. Very near to that, a little sandwich place called Heska's Sugar Shack, which is not the fastest moving, but the sammitches are fantastic. And as TrojanHorse (always) points out, taking a right off of the 38 onto Wabash, and a left on Sessums leads you right to Hangar 24. But that's beer only. As you get further into Redlands the choices of eateries goes way up, but so do the crowds and unlikelihood of finding a decent place to park your bike.
You could also get the old-fashioned cheap burger at the A&W in Mentone, and finish at Hangar. They're maybe 5 minutes apart.