Preheat the oven to 200˚C and dust a large baking sheet with flour.
In a large mixing bowl, combine together the flours and bicarbonate of soda and make a well.
Measure the butter milk into a pyrex jug and then crack in the egg, whisk to combine.
Pour the mix into the well and then using a wooden spoon, bring the mix together with the dry ingredients until you have a dough.
Form six little palm sized buns and place on the baking sheet and sprinkle with rolled oats. Transfer to the oven for 40 minutes.
Remove from the oven and set on a wire wrack to cool completely.
For the burgers, fry the red onion in a frying pan with a little oil over a high heat to start and then lower it once it gets a little colour and then cook gently for about 8 minutes until softed right down. Set aside to cool completely.
Combine in a large mixing bowl the beef, mustard, worcestershire sauce, egg, breadcrumbs, cooled onions and season with sea salt and ground black pepper.
Form the meat mixture into 6 burger patties and place on a plate, cover with cling film and set aside in the fridge until you are ready to fry them.
To cook the burgers, place a large frying pan over high heat and add a little oil. Fry the burgers for 4-5 minutes either side until they are cooked all the way through. When you turn the burgers on the pan, add a slice of blue cheese to each one.
To serve, split the soda bread baps and fill with baby gem lettuce leaves, sliced tomato, the burgers and a good dollop of ketchup!