Question: what are the best tart cooking apples?
Answer: Jonagold. Tart with a honeyed sweetness, Jonagolds hold up exceptionally well in the oven. ... 
Honeycrisp. This is our desert-island apple. ... 
Braeburn. ... 
Mutsu. ... 
Winesap. ... 
Pink Lady (or Cripps Pink) ... 
Now, let's bake some apples!