01 -
In a large skillet over medium-high heat, cook ground beef and chopped onion, breaking up the meat with a spoon, until browned and cooked through, about 6 to 8 minutes. Drain excess fat.
02 -
Reduce heat to low. Add shredded cheddar, ketchup, mustard, Worcestershire sauce, salt, and black pepper. Stir until cheese has fully melted and mixture is combined. Remove from heat and let cool completely before assembling.
03 -
Lay one egg roll wrapper on a flat surface in a diamond shape. Place 2 tablespoons of filling into the center. Fold bottom corner up over the filling, fold in both sides, and roll tightly toward the top. Brush top corner with beaten egg and press to seal. Repeat with remaining wrappers and filling.
04 -
Pour vegetable oil into a deep, heavy-bottomed pot or deep fryer to a depth of about 2 inches. Heat oil to 350°F, monitoring temperature with a deep-fry thermometer.
05 -
Working in batches, place egg rolls into hot oil and fry for 2 to 3 minutes per side, or until golden brown and crisp. Do not crowd the pan. Adjust heat as necessary to keep oil temperature steady.
06 -
Transfer fried egg rolls to a plate lined with paper towels to drain. Serve immediately with your choice of burger-style dipping sauces.