For the bombs
01 -
1 lb (450 g) pizza dough, room temperature
02 -
7 slices American cheese, halved
03 -
14 frozen mini meatballs, thawed
04 -
1/4 cup (45 g) baking soda
05 -
5 cups (1.2 L) water
06 -
1 large egg, beaten
07 -
Coarse sea salt, for topping
08 -
Yellow mustard, for serving (optional)