Place the chilli, spring onion, garlic, coriander, cumin, turmeric, oil and 2 tablespoons of water in a food processor. Process until almost smooth.
Cook the rice in a large saucepan of boiling water for 25-30 minutes or until tender. Drain well.
Meanwhile, heat a large saucepan over medium heat. Add the onion and 1 tablespoon water and cook, stirring, for 3 minutes or until the onion softens. Add the cauliflower, pumpkin, chickpeas, capsicum and chilli mixture and cook, stirring, for 1 minute or until aromatic.
Add the evaporated milk and bring to the boil. Reduce heat to low. Simmer, covered, for 10 minutes or until the vegetables are tender.
Divide the rice and curry among serving bowls. Top with cashew and extra coriander. Season with pepper to serve.