Curried Sweet Potato Soup

Ingredients

• • 1 large sweet potato, about 1 ⅓ lb (600 g), peeled and diced
  • 1 onion, chopped
  • 2 garlic cloves, coarsely chopped
  • 3 tbsp (45 ml) olive oil, plus more for serving
  • 1 tsp curry powder
  • 6 cups (1.5 litre) low-sodium vegetable broth
  • 2 potatoes, peeled and diced
  • 1 can (19 oz/540 ml) chickpeas, rinsed and drained
  • ¾ cup (100 g ) raw unsalted cashews
  • ½ tsp garam masala
  • ½ cup (70 g) raisins
  • Plain yogurt (optional)
  • Cilantro leaves, to taste
  • Naan bread (optional)