YOU WILL NEED:  4 skinless free range chicken breast fillets salt and freshly ground black pepper Cornflour for dredging 5 Tablespoons butter 2 Tablespoons olive oil 1 red onion, peeled thinly sliced 1 punnet of mushrooms, cleaned and sliced 2 garlic cloves, crushed 2 teaspoons tomato paste – a sundried tomato paste works really well