I don't know if it's the best burger, but it's the one I like the most.
I make a ball of minced meat of approximately 350 grams, add a little salt and pepper and knead it a little with my hands.
Then I put it on a very hot plate, this is very important, I count 15 seconds and I flatten it with the spatula. Now I add a little chopped onion, mixed with mustard and olive oil, when the burger can come off, I turn it over and let the onions burn a little, I add cheddar on top and cover it with a special lid so that it melt.
I remove the hamburger and put a little butter and the hamburger bread in the place where it was cooked so that it brings out all that flavor.
Usually you add a little barbecue sauce, garlic mayonnaise and a few slices of cucumber.
What is your favorite?