In a bowl, combine the ground beef, onion, egg, breadcrumbs, nutmeg, salt and pepper. We like mixing it first with a spoon until it’s incorporated, then we mix it with our hands, so the mixture is fully combined and soft.
16 ounces lean ground beef, 1 onion, 1 egg, ¼ cup breadcrumbs, ½ teaspoon salt, ½ teaspoon pepper, ¼ teaspoon ground nutmeg
Form and roll the meatballs with your hands - they should be around 1 ½ tablespoons in size.
Arrange the meatballs in batches in the air fryer basket. Spray with a bit of cooking oil and cook for 7 minutes at 180ºC (350°F). Shake them a bit, and cook them for 5 more minutes.
1 tablespoon olive oil
Heat a skillet to medium, add the butter, and let it melt. Then, add the flour and mix well to form a roux (a thick paste).
2 tablespoons butter, 2 tablespoons all-purpose flour
Once the roux has been formed, add the beef stock and remove it well. Cook for a couple of minutes, or until it thickens.
1 ½ cup beef stock
Add the sour cream and Worcestershire sauce and fully combine. Taste and adjust salt and pepper.
¼ cup sour cream, 2 tablespoons Worcestershire sauce
Serve the meatballs with the sauce, and fresh parsley over mashed potatoes.