Grandma's Meatball Sandwich

In this recipe from Owen Han's cookbook, “Stacked,” these extra-tender meatballs are simmered in tomato sauce and make delicious sandwiches.

Sungold Soupy Shrimp and Tomato Meatballs Recipe

Meanwhile, heat oil in a large pot over medium-low heat. Add onion and ½ teaspoon salt; cook until softened, stirring…