Mix grated potato, mashed potato, flour, salt, baking powder, egg yolk, and milk together until you have a thick, spreadable batter
Cook boxty in a butter and oil pan over medium heat, flattening slightly, for 3-4 minutes per side until golden and crispy
Cook bacon until crispy and set aside
Brown sausages until cooked through
Fry black and white pudding for about 2 minutes per side until crisp on the edges
Stack all components together on a hot pan with good butter
