Cheeseburger Pretzel Balls

Ingredients :

for 14 balls
1 lb pizza dough(455 g), left out at room temperature for 15-20 minutes
7 slices american cheese, cut in half
14 frozen mini meatballs, thawed
¼ cup baking soda(45 g)
5 cups water(1.2 L)
1 egg, beaten
coarse sea salt
yellow mustard, for serving (optional)

Preparation :

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