DETAILS Prep: 10-15 minutesCook: 40 minutes INGREDIENTS 160g red onion (about 1 medium), quartered160g deseeded and skin-on butternut squash, sliced into 2cm-thick wedges160g Brussels sprouts, halved2 tbsp extra-virgin olive oil, plus extra for drizzling2 tsp cumin seeds1 tsp ground cinnamon1 tsp dried chilli flakes2 tsp sumac, plus extra to serve2 wholemeal pittas, torn into chunks200g halloumi, cut into ...