Mushroom, Caramelized Onion and Cheddar Burger

This recipe is for a pretty classic burger, but jazzed up with the most synergistically awesome flavour-enhancers of all time: mushrooms, caramelized onions and old cheddar. The caramelized onion part means that the patties are a tad bit more time-consuming than my usual fare. But the time is well, well worth it for the extra flavour punch. Just trust me on this one.

Recipe and photo courtesy of Sarah from Kiwi & Bean.

Prep Time: 45 mins. | Cook Time: 10 mins. | Makes: 8 burgers.

Ingredients

2 pounds good quality ground beef
2 onions, sliced in thin half moons
1/2 pound mushrooms, thinly sliced
2 tablespoons extra virgin olive oil
1 tablespoon balsamic vinegar
1 cup grated extra old cheddar cheese
Few sprigs fresh thyme
Salt and pepper

Method

1. Heat the olive oil in a large skillet set over medium heat. Add the onions, and let them cook, stirring every few minutes, until they are very soft and very brown. If they start to look dry, drizzle in the balsamic vinegar.
2. When the onions are cooked, remove them to a bowl and add the sliced mushrooms to the pan. Do NOT flip them over or even touch them until they turn brown, then flip them and let the other side brown. When they are nice and brown, take them off the heat and dump them into the onion bowl.
3. Let the onion-mushroom mixture cool, and then chop it up very finely. Combine the chopped onion-mushroom mixture with the ground beef, thyme and cheddar. Gently mix it all together with your hands, and then form into 8 burger patties.
4. Season the patties with salt and pepper just before putting them on the grill. Grill them to desired doneness, and serve on buns or lettuce leaves.