Spicy rice with chickpeas

Ingredients

• 1 tbsp canola oil
• 1 onion (sliced)
• 1/4 cup curry paste (medium)
• 1 cup basmati rice (rinsed)
• 2 cups water
• 1 orange sweet potato (peeled and chopped into small chunks)
• 4 tomatoes (chopped)
• 1/4 cup sultanas
• 1 398ml can chickpeas (drained and rinsed)
• 1/4 cup cilantro (chopped)
• 1/3 cup unsalted cashew nuts (roughly chopped)