Mary’s Classic Soda Bread Makes 1 round loaf INGREDIENTS 8 oz plain flour  8 oz wholemeal (whole wheat) flour  1 tsp salt  1 tsp baking soda  1 tbsp molasses or treacle 1½ oz butter, melted (about 2 tbsp), plus extra to brush 1 free-range egg, beaten 13½ fl oz buttermilk  DIRECTIONS Preheat the oven to…