Ingredients:
preparation:
1.- First, we mix the minced meat with the crushed oats flakes with the hands, the ketchup, the mustard and the egg until obtaining a compact and homogenous mass. Season and add the oregano.
2.- Divided the dough into several equal pieces, depending on the size will come more hamburgers or less.
3.- Heat a grill or an iron with the oil and brown the hamburgers on both sides and then let them simmer for about 5 to 7 minutes.
4.- At the moment of serving, peel the onion and cut into rings and warm them a little on the same plate for a couple of minutes.
5.- Open the buns and spread them with the butter. We also brown them lightly on the plate.
6.- We have the hamburgers in each of the muffins, on the meat we placed the onion rings, and optionally a few slices of tomato and lettuce leaves. They are also seasoned with ketchup
