Mediterranean Chicken and Couscous Salad

Name: Mediterranean Chicken and Couscous Salad
Ingredients: 4 pieces butterflied chicken breast fillets; 200 grams aubergine/eggplant – sliced; 4 pieces ripe tomatoes - 200g/7oz total, cut into halves; 1 piece white onion – 100g/3.5oz, quartered; 1 piece courgette/zucchini – about 200g/7oz piece, cut in half lengthwise; 30 milliliters olive oil; 2 pieces sprigs of rosemary; 1 piece a few tarragon leaves; 2 pieces cloves chopped garlic; 400 grams couscous; 500 milliliters chicken stock; 1 piece lemon, juice and zest; 1 piece salt, to taste; 1 piece pepper, to taste