Hmmm- I wonder if I'm thinking of the same bread. My mom used to make little tea sandwiches with what I thought was Boston brown bread. She used a cream cheese spread with nuts in it.
It's been a couple of decades since I've had it, so perhaps I'm thinking of something else.
I like it, and creamed cheese is correct, but not the nuts. I've made it, and I think it's pretty good. Here's one recipe:
2 cups rye meal
2 cups cornmeal
2 cups whole wheat flour
1 1/2 teaspoons baking soda
1/2 teaspoon salt
1 1/3 cups dark molasses
4 cups milk
2 cups raisins
4 tablespoons unsalted butter
It's cooked by steaming it stove top, or in the oven. I use #303 cans, but you can use loaf pans, too. And it's diabetic friendly.
Brown bread dates back to the colonies.