Mel's Diner's site is perennially appearing and disappearing. But trust me, they're still there.

(Hildesheimer Straße, near the Messe in Laatzen -- address at
http://www.qype.com/place/13177-Mel-s-Diner-Laatzen. IMO the best American restaurant in town, even if they also seem to think "American food" is nothing but burgers, but at least it's more authentic than most places if 1950s diners are your thing.)
The Star Diner one's OK, but the forum software inserted a parenthesis at the end. Delete it and the site works.

Pistols at dawn? I prefer tactical nuclear weapons. For myself, that is. You can have the pistol if you insist.
Cheers,
Fairfax71