sentence: in a bowl add ground beef salt pepper 1 egg dijon mustard and bread crumbs sentence: mix the ingredients with hand sentence: add vegetable oil in a pan and fry the meat patty in it sentence: put 2 slices of cheese on top and heat until they melt sentence: transfer the burger aside and fry some onion in the same pan sentence: place some tomato sauce the burger patty the onions on a bun and cover with another bun on