Shady Maple Smorgasbord for good Penn Dutch food. The Smorgasbord is huuugggeee. And it is just a few miles down the road from Leola in Blue Ball. Check their website for pricing and the daily dinner feature(I know Tues night is Seafood night). And their breakfast is really good.
They also have a grocery store next door. It has some of the best baked goods. And their homemade fresh sausage is delicious(Apple is my favorite).
http://shady-maple.com/smorgasbord
Also, Yoder's in New Holland is a smaller Smorgasbord but is one of my favorites(and it's cheaper than Shady Maple).
Bloomfield Square is a good diner. They are owned by a Greek family. So they feature a lot of Greek dishes.
Oh, and just a heads up. Any Mennonite run establishment will be closed on Sunday(incl Shady Maple and Yoders). I lived in Lanc Co most of my life and would still manage to forget that.