Hm…. I know this is sacreligious- but I absolutely hate all the food at Shea Stadium. I love my Mets, just hate the food. Even the hot dog buns are stale! The Carvel ice cream is not bad- but thats about it. What I normally do is, stop at Sarge’s across the street from my apartment in Manhattan, and get a huge lean corned beef on club. This is a really big sandwich, and great to take into shea- in a clear plastic bag of course.
The picnic grill area is not bad at Yankee stadium though. At least you can get a decent grilled burger.
I did enjoy eating at the Rochester RedWing’s Frontier Field last year. They had the best pulled pork nachos. Yummy, and there had to be about 2 lbs of em. Even the bf couldn’t finish them off.
Baltimore had some passable bbq at Boog Powells, and made for a fine day to watch baseball.