Ingredients

1 tbsp. vegetable oil

1 Onion, finely chopped

1 lb. ground beef

kosher salt

Freshly ground black pepper

4 slices American cheese

1/2 c. shredded Cheddar

ketchup

mustard

4 hoagie rolls

1 c. finely shredded lettuce

1 tomato, sliced

Preparation

Step 1Heat a large nonstick pan over medium-high heat and grease with vegetable oil. Add onion and sauté until beginning to soften, then add ground beef and season with salt and pepper. Use a spatula to break up the beef. When the beef is browned, chop both cheeses into the ground beef with the same spatula. Drizzle ketchup and mustard over mixture and stir to combine. Remove from heat.Step 2Prepare four sandwich rolls: Top each bottom half of the roll with a handful of lettuce. Load the meat and cheese mixture onto each roll, then top with sliced tomatoes. Top with second half of roll and serve immediately.