1. Preheat oven to 450F. On lightly floured work surface, unroll pizza dough and stretch into square; cut into 8 square portions. Wrap each portion of dough around 1 Panino; pinch seams to securely enclose filling. Arrange on parchment paper–lined greased baking sheet.

2. In large saucepan, combine 10 cups water with baking soda; bring to boil. Add pretzels, 2 at a time, to boiling water; cook for 30 seconds. Using large, flat spatula, return to prepared baking sheet. Beat egg lightly with 1 tbsp water; brush over each pretzel. Sprinkle with coarse salt.

3. Bake for 12 to 15 minutes or until dark golden brown. Transfer to rack; let cool for at least 10 minutes. Serve warm or at room temperature with spicy mustard for dipping.

Tip: Pretzel salt can be purchased at bulk food stores or online specialty retailers.