No Saint Patrick's Day celebration is complete without a loaf of freshly baked Irish soda bread. It's name comes from the use of baking soda as the leaving agent in the bread instead of yeast. The mixing of baking soda with buttermilk causes a chemical reaction (carbon dioxide) which makes the dough rise. In this recipe, sunflower seeds and oats have been added to give the bread some texture but feel free use raisins or currants. Serve this Irish soda bread with a stick of heavenly Irish butter.