sentence: chop up the meat and form into a patty sentence: mix mustard seeds onions and herbs with the meat sentence: form the meat into a patty sentence: season the burger sentence: add oil to the pan sentence: place the burger in the pan sentence: flip the burger over sentence: toast the buns in a pan sentence: spread pesto on the bottom bun sentence: slice a tomato sentence: layer the burger with lettuce tomato patty and onion