1.Make mint chimichurri; blend or process half the mint with capsicum, oil, chilli and cumin until finely chopped. Transfer to small bowl; stir in remaining mint, season to taste.
2.Cook onion on heated oiled barbecue (or grill or grill pan) until just tender.
3.Place onion in large bowl with capsicum and cheese; toss gently to combine, season to taste.
4.Serve salad drizzled with chimichurri.
Chimichurri is a spicy marinade and dipping sauce often served with grilled meat; it is popular in many Latin and South American countries, especially Argentina.