Ingredients:

4 cups whole wheat flour
2 cups unbleached all-purpose flour
1 teaspoon salt
1 teaspoon baking soda
1/2 teaspoon white sugar or brown sugar
1 cup skim milk
1 teaspoon lemon juice
Directions:

Mix milk and lemon.
Combine dry ingredients.
Add milk and lemon mixture (buttermilk may be used instead).
On floured bread board (I use whole wheat) knead dough for no more than a minute.
Shape dough into a circle with a height of about two inches.
Place on lightly oiled baking sheet.
With (sharp) floured knife, cut an x nearly halfway through the dough.
Bake about 40 minutes in 400F degrees degree oven.
Dough should sound hollow when tapped with knuckles or handle of spoon.
Place loaf on wire rack and let rest at least an hour before slicing.
Nutrition Facts:

Calories 264; Calories from Fat 10 (4%); Total Fat 1.2g; Saturated Fat 0.2g; Monounsaturated Fat 0.2g; Polyunsaturated Fat 0.5g; Trans Fat 0.0g; Cholesterol 0mg; Sodium 375mg; Potassium 266mg; Total Carbohydrate 55.5g; Dietary Fiber 6.5g;Sugars 0.5g; Protein 10.1g; Vitamin A 54mcg; Vitamin B6 0.2mg; Vitamin B12 0.1mcg; Vitamin C 0mg; Vitamin E 0mcg; Calcium 55mg; Iron 3mg

Wholemeal flour with large flakes of bran and wheat germ, or white flour or a mixture leavened with baking soda and moistened with buttermilk. The acid in the buttermilk reacts with the baking soda, which is an alkali, creating bubbles of carbon dioxide which rise the bread. Soda breads have the heft of a yeast bread but are made in minutes and the dough can be shaped into scones or a round loaf, depending on the occasion.

source: http://fitceleb.imnotobsessed.com/2008/03/17/whole-wheat-irish-soda-brea...