Pork Meatballs With Spicy Sauce

Name: Pork Meatballs With Spicy Sauce
Ingredients: 3 tablespoons extra-virgin olive oil; 1 large onion, finely diced; Kosher salt; 2 tablespoons tomato paste; 1 pound ground pork shoulder; 2 teaspoons red pepper flakes; 2 28-ounce cans whole San Marzano tomatoes, crushed by hand; 2 pounds ground pork shoulder; 3 to 4 pickled hot cherry peppers, minced, plus 2 to 3 tablespoons pickling liquid from the jar; 4 slices white bread, finely chopped; 3 large eggs, lightly beaten; 2 tablespoons extra-virgin olive oil; Polenta, for serving (optional)