Another tell is restaurants that have English menus. Nope, not if I can help it. You will get "tourist-ized" food, and again won't be authentic. Probably priced to tourist expectations, too.
Even in the heart of Munich, I can walk 2 blocks off of Marienplatz, down a side street, and walk into a place where the food is cheap, the people are in a boisterous, good mood, and I might have to point at others' dishes to order. Usually they don't mind--they are entertained immensely by the tourist among their midst, and generally helpful.
While you do get the occasional something you can't handle--too spicy, condiments you don't like, etc. it's a much more rewarding experience. And quite often, so cheap you can order again, and still be money ahead.
One thing I am entertained throughout Europe: when beer and/or wine is prices less than a Coke. You know who orders the Coke, and what is the preferred local drink.