There's a bunch of foods that have the word "Boston" in their
name:
- Boston Baked Beans/Boston Brown Beans: from molasses, a
by-product of rum.
- Boston Cream Pie: not a pie, but a cake and now the official
dessert of Massachusetts.
- Boston Cream Doughnut: filled with vanilla or custard and
topped with chocolate glaze.
- Boston Clam Chowder: also known as New England Clam Chowder,
this is a white soup(where Manhattan is red, etc).
- Etc?
Historically, we may need a scholar to give more intimate detail
on the "specific" foods that are or were associated with Boston, if
that's what this question is asking.