I did the Linden tour 2 or 3 summers ago as well. We stopped at that gas station and perused the memorabilia there for a bit. We (my daughter and I) had to walk around/through the people eating there to see it all. You could definitely tell we came in just for that.

And yes, it is not really a restaurant, more like a small store with a grill. We did not eat a burger there, wish we had though, but we did buy some snacks.

If anyone plans on making that trip in the future please let me know as I live about 2 1/2 hours away and would love to meet and see the sights with other Borderers.