Argentine-Style Beef Burger with Cheese Melt and Fries

Method

1. In a bowl, mix ground beef and beef fat (if using) with salt and pepper. Form into 4 equal patties.
2. Heat a skillet over medium-high heat. Cook patties for 3-4 minutes per side, until browned and cooked to desired doneness. Top with cheese and let melt.
3. While patties cook, slice potatoes into 1/2-inch thick strips. Soak in cold water for 30 minutes, then drain and pat dry.
4. Heat oil in a deep fryer or heavy pot to 350°F (175°C). Fry potatoes in batches until golden brown, about 3-4 minutes. Drain on paper towels.
5. Toast sesame seed buns. Assemble burgers with lettuce, tomato, onion, and patty. Serve with fries.
6. Check that the ground meat reaches 71°C (160°F) throughout before serving.