• Divide the meat or chicken into 4 portions and season with salt and pepper. If you are using ground beef, shape each portion into a ball and flatten it with the palm of your hand.
• Heat a little oil in a pan over medium heat and, when it is hot, lay in the patties. Cook them for 3 to 5 minutes on each side.
• While they cook, start assembling the burgers. Open each bun, lay in the lettuce leaves and the tomato slices. The onion can go in raw, cut into strips, or browned first with a little honey. Either works.
• When the patties are almost done, put a slice of cheese on each so it starts melting, give it a minute, and lift it onto the onion in the bun. If you are using shredded chicken, this is the point to add it. Spoon over the sauce and close the burger. A minute on a grill or in the microwave finishes it.

For the Sauce

• Finely chop the parsley and put it in a bowl with the mostaneza, the mustard mayonnaise, the cream, the Dijon mustard and the honey. Stir until everything is combined.