Lemon, chicken and olive salad

Ingredients (serves 4): 3 chicken breast fillets, trimmed 1 large lemon, sliced 1 red onion, halved, thinly sliced 100g pitted Kalamata olives, chopped (see note) ½ cup basil leaves, roughly torn Baby lettuce salad leaves, to serve   Method: Place chicken fillets in a saucepan and cover with cold water. Bring to the boil over…