In a large skillet over medium-high heat, brown the ground beef with the diced onions until fully cooked and onions are translucent, then drain excess grease.
Stir in the ketchup, mustard, and Worcestershire sauce, simmering for 2 minutes.
Remove from heat and stir in the shredded cheese until melted, then set aside to cool slightly.
Preheat your oven to 425°F (220°C) and bring a large pot of water to a boil with the baking soda.
Divide pizza dough into 8-10 equal portions, flatten each into a circle, place a spoonful of beef mixture in the center, and pinch edges to seal into a ball.
Drop each ball into the boiling water for 30 seconds, then remove with a slotted spoon to a parchment-lined baking sheet.
Brush the tops with egg wash and sprinkle with sea salt.
Bake for 15 minutes or until golden brown.