Use this Spicy Meat Sauce to make Spicy Pork Meatball Sliders from The Meatball Shop.
Heat olive oil in a large saucepan over medium heat. Add onion, pork, and pepper flakes; cook, stirring, until meat is cooked through and onions are soft and beginning to brown, about 15 minutes. Season with salt and add tomato paste and cook, stirring, 5 minutes more.
Add canned tomatoes and bring to a boil; immediately reduce to a simmer and cook, stirring occasionally, for 35 minutes.