In a large bowl, combine your choice of ground meat with breadcrumbs, eggs, minced garlic, salt, and pepper. Mix thoroughly until well combined and slightly sticky.

Using your hands, roll the meat mixture into bite-sized balls, approximately 1 inch in diameter, and place on a parchment-lined baking sheet.

In a skillet, melt butter or oil over medium heat, add onions, and cook until golden brown and fragrant, about 15–20 minutes.

In your slow cooker, combine caramelized onions with beef broth and soy sauce, stirring well to create a rich gravy.

Gently place the meatballs into the sauce, cover, and cook on low for 6 hours or high for 3 hours, until fully cooked.

Serve hot, drizzled with sauce over your choice of rice, pasta, or alongside crusty bread.