Mix Your Ingredients: In a large bowl, combine the ground meat, chopped onion, minced garlic, breadcrumbs, egg, parsley, mustard, salt, and pepper. Mix until well combined, but avoid overworking the meat.
Form the Meatballs: With clean hands, take a handful of the meat mixture and roll it into small, even-sized balls – about the size of a golf ball works perfectly.
Heat the Pan: In a large skillet, heat a thin layer of oil over medium heat. Allow your oil to get nice and hot before adding the meatballs.
Cook the Meatballs: Place the meatballs in the hot skillet, ensuring you don't overcrowd the pan. Fry them for about 5-7 minutes on each side, or until they are golden brown and completely cooked through.
Serve and Enjoy: Once cooked, remove the meatballs and let them drain on a paper towel. Serve them hot, paired with your favorite dipping sauce or gravy.