Turkey meatballs with roasted veg and brown rice

Name: Turkey meatballs with roasted veg and brown rice
Ingredients: 200g/7oz brown rice; 4 tbsp olive oil, plus extra for drizzling; 2 peppers, chopped into 1–2cm/½–¾in pieces; 2 medium courgettes, 1 coarsely grated and 1 chopped into 1–2cm/½–¾in pieces; 1 red onion, chopped into 1–2cm/½–¾in pieces; 1 tbsp za’atar; 500g/1lb 2oz turkey mince (ideally around 5–10% fat); 1 lemon, zest and juice; 2–4 spring onions, thinly sliced; 1 tbsp finely chopped fresh parsley; 2 tbsp finely chopped fresh mint; 150g/5½oz natural yoghurt; 100g/3½oz rocket; salt and freshly ground black pepper