One-tray Balsamic Pesto Chicken with Broccolini + Tomato Medley

• 400 g chicken thigh fillets
• 1 broccolini (or asparagus)
• 300 g tomato medley
• 1 tbsp extra virgin olive oil
• 3 tbsp pesto
• 2 tbsp balsamic vinegar
• 2 tbsp water