Mix together the yogurt, curry powder, mango chutney and lemon zest with some seasoning in a large bowl. Add the grains, breaking them up with your fingers as you go, then add the chicken, onions, courgette and most of the coriander. Give everything a good stir and divide between two containers. Sprinkle over the remaining coriander, flaked almonds and nestle a lemon wedge into each lunchbox.