Cut the meat into steaks about 1/2″ (1.5 cm) thick. Grind the black/mixed pepper and rub the meat with it on all sides.
Pour the beer, olive oil, garlic, sugar and a little salt in a suitable oven dish. Stir well to mix all the ingredients for the marinade. Put the steaks in it and roll them well from all sides. Leave them for at least 2 hours in the fridge.
Heat the grill well. Smear it with a little oil if needed and grill the steaks on both sides until ready. Cooking time varies but when they actually obtain a nice crisp and grill marks, they're ready.
Be careful not to grill them too long so they don't end up too dry.