Meatballs are one of my favorite family meals. They’re a flavorful way to dress up ground beef, and everyone at my table — even the picky eaters — loves them. Until recently, classic meatballs simmered in rich tomato sauce remained a weekend-only project. But that was before I discovered Instant Pot meatballs, which are ready in under 30 minutes, thanks to my trusty pressure cooker and a supermarket shortcut.