Add cauliflower, onion, and chickpeas to a large baking tray.
In a small bowl, combine garlic, ginger, curry powder, and olive oil. Drizzle over the cauliflower mixture. Bake for 30 minutes or until golden.
Meanwhile, cook the brown rice: Combine rice and water in a saucepan. Bring to a boil, reduce heat, and simmer until rice is fully cooked, about 20-25 minutes.
Add the cashews to the tray, and bake for an additional 5 minutes.
Serve the chickpea mixture overtop the spinach alongside rice, top with cilantro and lime juice.