In a bowl, combine the 750 g round beef, minced garlic, finely chopped onion, basil, and parsley. Knead gently until just mixed, then shape into 12-16 meatballs of roughly equal size.
Melt the 40 g butter in a pan over medium-high heat until foaming.
Add the meatballs to the pan and fry for 15-18 minutes, turning occasionally, until browned on all sides and cooked through (internal temperature 63 °C / 145 °F).