Animal-Style Patty Melts (Vegan)

For the onions:
Heat oil in a small pan until sizzling. Add onions, salt, and pepper, and cook until dark golden brown, stirring occasionally. It should take about 15 minutes.

For the sandwiches:
Heat oil in a large skillet. Add burger patties and cook on one side until dark brown and delicious. Flip the burger, cook for about 2 minutes, then lift it up with a spatula and add a squirt of mustard underneath. Place the patty back on top and let cook. Flip the patty one more time, adding mustard under the other side.

Butter the outer sides of all slices of bread. Add cheese, burger patty, caramelized onions, and thousand island dressing. Add to a hot pan and cook until golden brown. Flip the sandwich, then use a foil-wrapped pan to smash the sandwich down. Let the sandwich continue to cook until dark brown on all sides. With rye bread, the darker and more buttery it is, the more delicious.