Step 1 Place basil, parsley, parmesan, nuts and garlic into a food processor. Blend until chopped.
Step 2 With motor running, gradually add oil and process until smooth. Add 3–4 tablespoons warm water to reach a fairly smooth consistency. Season with freshly ground black pepper.
Step 3 Heat a chargrill pan or barbecue to medium high. Spray chicken with oil and cook for 5 minutes on each side, or until cooked through , sprinkling with lemon juice as the chicken cooks.
Step 4 Meanwhile, steam potato slices for 5 minutes in the microwave, until tender.
Step 5 Slice chicken and serve stacked on top of potato. Spoon pesto over chicken and potato. Serve with chargrilled vegetables.