Soft Pretzel Bites

On a lightly floured surface, divide 1 pound refrigerated pizza dough into 4 pieces and roll into skinny 14-inch-long ropes. Cut each rope into twelve 1-inch pieces. Bring 4 C. water to a boil in a large pot. Stir in 1/4 C. baking soda until dissolved, then reduce heat to a simmer and cook dough, in batches, until puffy and shiny, 30 seconds. Transfer with a slotted spoon to a parchment-lined baking sheet. Brush dough with 2 T. melted butter and sprinkle with coarse salt. Bake at 400°F until golden, 15 minutes. Serve with mustard.