2 large eggs
3 oz. parmesan cheese, grated
1/2 tsp. freshly ground black pepper
1/2 tsp. kosher salt
1 tbsp. spicy brown mustard
1/4 cup chopped fresh basil
1 1/2 cups fresh whole-wheat breadcrumbs
1 3/4 pounds 90% lean ground sirloin
1/2 cup ketchup, divided
6 cloves garlic
2 cups chopped red onion
1 tbsp. olive oil