Usually Biergarten, but with only one Epcot day this upcoming trip we may actually skip TS altogether since it's F&W. And it hurts to know I'm skipping it. It's our Disney favorite, not just Epcot.
Our tradition is to eat at San Angel Inn for our first full day lunch, then Biergarten for dinner. The best apple strudel I have ever had was hot out of the oven at Sommerfest in Germany.
Our Epcot day for our upcoming trip was the hardest to plan since there are SO MANY amazing food options! We opted for Garden Grill breakfast and snacking around the world the rest of the day. I feel like I need to do an adults-only trip sometime and just spend like 4 days at Epcot trying everything! I really want to try Biergarten and Via Napoli!
We always go to Via Napoli for lunch/dinner. I also always go to Les Halles in France for quick lunch. Also, I usually start and end my trip with a half and half from the pub at Rose and Crown.
Because there are so many option at Epcot I don't really have a must do each time restaurant but I do always get a Moorish coffee at Tangerine Cafe even if it is 100 degrees out.