Classic Meat lover's Calzone

Ingredients

• ¾ cup warm water
• 1 ½ teaspoons instant yeast, (1/2 packet)
• 2 cups all-purpose flour, plus more for dusting
• 1 ½ teaspoons kosher salt
• 1 tablespoon olive oil
• 3 links Italian sausage, casings removed and sausage crumbled
• ½ yellow onion, diced
• ½ teaspoon kosher salt, plus a pinch
• ½ teaspoon black pepper
• ½ cup marinara sauce, plus more for dipping
• 8 slices deli ham
• 20 slices pepperoni
• 1 cup shredded mozzarella cheese
• 1 large egg