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Mix 3 tbsp oil with the crushed garlic, chilli flakes and rosemary. Thread alternate pieces of mushroom, peach, courgette and red onion onto each skewer – you can get two pieces of everything on each. Brush the kebabs with the flavoured olive oil and season with salt and black pepper, then set aside. The kebabs can be made the day before and kept in the fridge.
Barbecue or grill the skewers for 4-5 mins on each side or until cooked through and nicely charred. Pile onto a platter and serve with the avocado dressing and salad on the side.