Homemade hamburger

1. Before grinding the beef, place the meat in the freezer for 15 minutes.
2. Assemble the metal grinder attachment with the fine-mesh plate and attach it to the food processor.
3. Remove the beef shoulder from the freezer.
4. In a large bowl, combine the beef, white onion, parsley, black pepper, garlic powder, salt, and chili pepper.
5. Set the food processor to speed 4 and place the beef into the metal mincing attachment.
6. Shape the ground beef into 4 patties and place them on a baking sheet lined with parchment paper. Let the patties rest for 15 minutes.
7. Heat a skillet over high heat until very hot. Place the patties in the skillet and cook for 2 minutes until a crust forms around the edges.
8. Flip the patties and place a slice of cheese on top of each one. Cook for another 2 minutes.
9. Assemble the burger, topping it with coleslaw and barbecue sauce, or add your favorite toppings to customize it.