Grilled Patty Melt (Print Version)

# Ingredients:

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01 - 6 thick slices of rye bread
02 - 2 large yellow onions, sliced thin
03 - 5 tablespoons of unsalted butter
04 - 1 pound of 80/20 ground beef
05 - 6 ounces of swiss cheese, shredded
06 - 3 teaspoons of avocado oil
07 - 2 teaspoons of apple cider vinegar

# Instructions:

01 - Melt the butter over medium heat, then let the onions cook covered for about 5 minutes. Stir them every so often on low heat for 30-35 minutes until they're dark brown. Finish by adding the vinegar and scraping the pan.
02 - Shape 3 burger patties and season them right before you cook. Heat up your griddle to about 375-400°F.
03 - Using some oil, cook the patties for 3 minutes on each side.
04 - Spread butter on the bread slices and toast each side on the griddle for 1-2 minutes until golden.
05 - Lay cheese, caramelized onions, and a burger patty on toasted bread. Place another bread slice on top, press gently, and serve up.

# Notes:

01 - If stored separately, you can prep parts up to 2 days in advance.
02 - You can keep the whole thing in the fridge for 3 days after it's made.
03 - It's not something that freezes well.