some quick notes on the ingredients
1 1/2 cups whole wheat flour
1 1/2 cups unbleached white flour
1 1/2 teaspoons baking soda
1 teaspoon salt
3 tablespoons unsalted butter (close to room temp)
1 cup skim milk
1 tablespoon vinegar (I use date vinegar)
2 tablespoons date molasses
I've found that about half whole-wheat and half white is the perfect mix. any more whole wheat and it falls apart, any less and it loses some character.
Traditionally, many soda breads call for buttermilk. I don't usually have buttermilk on hand, but I do have milk and something to sour it with. I use date vinegar as it provides a subtle yet interesting character. You could easily substitute lemon juice or apple cider vinegar. And if you really wanted, you could probably use buttermilk as well.
I love date molasses. It has a richness and sweetness vastly different than other sweeteners. Its higher in nutrients than many, and as it is pure fruit, it has a lower Glycemic Index score as well. But you can use any sweetener you prefer, from white sugar to honey to agave nectar. The beauty of this recipe is its ability to be modified without difficulty.