Is what you are wanting the Boston Brown Bread recipe? The gingerbread recipe I have that was my grandmother's is more a dessert than bread but here it is--
3 c. flour
1 1/2 tsp soda
1/2 tsp salt
2 eggs
3/4 c. brown sugar
1/2 c. melted fat
1/2 tsp cinnamon
1/2 tsp cloves
1/2 tsp nutmeg
2 tsp ginger
1 c. molasses
1 1/4 c. sour milk or 1 c. boiling water
Cream together the fat and sugar. Sift dry ingredients together. Add to creamed mixture alternately with liquid, beating well after each. Bake in a greased and lightly floured 9 x13" pan at 350 deg for 35-40 minutes or until done. Best served warm, possibly with a dollop of whipped cream.