Courgette and Rice Filo Pie

500g courgettes

75g long-grain white rice

½ medium red onion

75g hard goat’s cheese or mature Cheddar, grated

2 large eggs

2 tablespoons olive oil

dill, chopped

flat-leaf parsley, chopped

250g filo pastry

75g unsalted butter

Sea salt and freshly ground black pepper