1/2 cup ketchup, divided
2 large eggs
1/2 pound ground pork
1 1/2 pounds ground beef chuck, preferably 20% fat
3 tbsp. Worcestershire sauce
1 1/2 tsp. freshly ground black pepper, divided
2 1/4 tsp. kosher salt, divided
2 tbsp. neutral vegetable oil
4 cloves garlic
1 stalk celery
1 medium onion, coarsely chopped
1/3 cup whole milk
1 cup fine fresh breadcrumbs