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.

The meteoric rise of Owen Han, the king of sandwiches on TikTok

Owen Han didn't know how much the internet loved sandwiches when he posted a TikTok video of grilled chicken, bacon,…