Beef & Cheese Piroshki (video)

Name: Beef & Cheese Piroshki (video)
Prep time: 1 h 30 min
Cook time: 25 min
Total time: 1 h 55 min
Cuisine: European, Eastern European
Ingredients: 1 1/2 cups milk; 1 tablespoon dry yeast; 1/2 tablespoon sugar; 1 teaspoon salt; 3 tablespoons melted butter; 1 egg; 3 1/2 cups all-purpose flour; 1 pound ground beef (turkey or pork); 1/2 large onion; 3 garlic cloves; 1 large egg; 1 1/2 cups mozzarella cheese; 1 cup cheddar cheese; 1 1/2 teaspoons salt; 1/2 teaspoon ground black pepper; 1/4 cup fresh chopped dill; 1 beaten egg (for egg wash)