The Whitney Portal Store has a kitchen and grill. It is also said to have great burgers. That may be due to the fact that most of its customers have just finished hiking Mount Whitney. The store also has hiking supplies for those who need something last minute.
I'd wanted to stop here and sample the burgers. But, after finishing the hike, my stomach was still queasy from the elevation gain and loss. We were also pretty beat and had long drives ahead of us. So I can't give a first hand account, but I have heard some pretty rave reviews.
There is a grill at the Whitney Portal Store at which you can get breakfast, lunch, and dinner. Hours vary depending on the time of the year. Current posted hours are as follows:
If you're camping at the Portal campground you can grab a bite here instead of cooking your own. I have no photo nor did I visit the store because the times I was at the Portal were well outside of the operating hours...and very dark indeed!