Remove the skin of the blood sausage and cut it into bite-sized pieces.
Blanch the brad beans in lightly salted water for 2 minutes, then rinse in cold water and pop the beans out of their thick, leathery skins by squeezing gently.
Meanwhile gently sauté the onion in the oil, add the beans to warm through. In another frying pan fry the sausage pieces for about 5 minutes. Add the sausage to the beans, stir through and cook for another couple of minutes. Neither the sausage nor the broad beans should fall apart!
Serve with cocktail stick or toothpicks.