Pimento Meatballs with Olive Tapenade

Name: Pimento Meatballs with Olive Tapenade
Ingredients: 1/2 cup pitted green olives; 1 cup fresh parsley; 5 scallions, roughly chopped; 1 1/2 tablespoons capers, drained and rinsed; 1 small clove garlic, roughly chopped; 2 teaspoons dijon mustard; 2 tablespoons extra-virgin olive oil; 1 pound ground beef chuck; 1 4-ounce jar pimentos, drained, patted dry and chopped; 1/2 cup panko breadcrumbs; 1 large egg, lightly beaten; Kosher salt; 2 tablespoons tomato paste; 2 1/2 cups low-sodium chicken broth; 1 tablespoon packed light brown sugar; 1 teaspoon red wine vinegar