For the beef filling
01 -
1 teaspoon olive oil
02 -
1 1/2 lb (680 g) lean ground beef, 85 to 90 percent lean
03 -
1 medium yellow onion, finely diced
04 -
2 cloves garlic, minced
05 -
3/4 teaspoon kosher salt, plus more to taste
06 -
1/2 teaspoon black pepper
07 -
8 oz (225 g) Velveeta cheese, cubed
08 -
2 tablespoons ketchup
09 -
2 tablespoons yellow mustard
10 -
1 tablespoon Worcestershire sauce
For serving
11 -
6 hamburger buns, toasted
12 -
6 slices American or cheddar cheese, optional
13 -
Dill pickle chips, for serving
14 -
Shredded lettuce, diced tomato, and sliced red onion, optional