Preheat the oven to 200°C, 400°F, Gas 6.
To make the ratatouille, heat the oil in a pan and add the vegetables one at a time, in the order given, cooking for two minutes each time. Add the basil and seasoning and cook gently with a lid on for about 10 minutes or until all is soft and tender. Leave to cool then chill until needed.
Toss the chicken cubes in the oil and spices, then coat in sesame seeds. Thread onto skewers alternating with the red onion and season. Cook in the oven on a baking sheet for 8-10 minutes or until the chicken is cooked through with no pink showing, and juicy.
Spoon the ratatouille into a bowl and adjust the seasoning if necessary – chilling dulls flavours. Serve with the chicken alongside.
For top tips on protecting you and your family when preparing raw meat and poultry, visit Food Safety in the Home and view the full Food safety at home video.