Was craving the FLYING DUTCHMAN from In-N-Out, so I made it at home🤍 it’s made with caramelized onions, cheesy beef patties, and homemade burger sauce. Ingredients For the burgers * 2 lbs ground beef * 2 large onions, sliced into 8 thick rings * 12 slices cheddar cheese * Salt + black pepper, to taste * Pinch of sugar, for the onions * Oil, for cooking Burger sauce * 1/2 cup mayonnaise * 1/3 cup ketchup * 1/3 cup sweet relish * 2 tbsp yellow mustard * 1 tbsp vinegar * 1/2 tsp sugar * Pinch of salt + black pepper Directions 1. Slice the onions into thick rings, keeping the rings intact. Heat a little oil in a cast-iron skillet over medium heat. Add the onion rings and season both sides with a small pinch of salt and sugar. Cook for about 3 minutes per side, or until softened and caramelized. Carefully transfer to parchment paper so the rings stay together. 2. Divide the 2 lbs of ground beef into 8 equal portions. Place each portion between parchment paper and flatten into thin p...