Grilled Stuffed Cheeseburger

Ingredients:

• 1/4 cup ketchup
• 1/4 cup mayonnaise
• 1/4 cup chopped pickles
• 2 tbsp mustard
• 220 g ground beef (7% fat)
• 4 slices American cheese (about 1/2 cup), cut into pieces
• Half a small red onion, finely chopped
• 450 g of store-bought pizza dough at room temperature
• 1 tbsp. l. olive oil
• 1 tbsp sesame seeds

Preparation:

1. In a small bowl, combine the ketchup, mayonnaise, pickles, and mustard until smooth. Cover and refrigerate until ready to serve.
2. In a medium bowl, combine ground beef, American cheese, red onion, 1 teaspoon salt, and a few grinds of black pepper until smooth. Form the mixture into 8 small patties, each weighing approximately 30 g (1 oz), about 5 cm (2 in) in diameter.
3. Divide the pizza dough into eight 60g (2.5 oz) pieces. Working with one piece at a time, roll it out into a 10cm (4 in) wide circle and place one patty in the center. Fold the edges of the dough over the patty, pinching them tightly in the center to seal the patty completely. Repeat with the remaining dough and patties. Cover and refrigerate until ready to grill (can be stored up to tomorrow).
4. Place a 12-inch cast iron skillet on the grill and preheat the grill to medium heat (about 350°F).
5. Once the griddle is hot, turn off the burner. Brush the tops of the buns with olive oil and sprinkle with sesame seeds. Place the buns on the hot cast iron griddle, making sure they don't touch. Cover the grill and cook, lifting the buns occasionally with grill tongs to prevent burning on the bottom, until the tops are golden brown and the centers are cooked through, 20–25 minutes. Let the buns cool for at least 15 minutes and serve with the "special sauce."