Dahl with Sweet Potato Spirals

Ingredients

• Dahl

  • 1 onion, finely chopped
  • 2 tbsp butter
  • 3 garlic cloves, grated (see note)
  • 1 tbsp fresh ginger, grated
  • 1 ½ tsp curry powder
  • 1 ½ tsp ground garam masala
  • 1 tsp ground turmeric
  • 4 cups (1 litre) water
  • 1 ½ cups (285 g) dried red lentils, rinsed and drained
  • ½ tsp sugar

• Toppings

  • 5 cups (340 g) sweet potatoes, cut into spirals (see note)
  • 2 tbsp (30 ml) vegetable oil
  • ½ tsp ground cumin
  • Cilantro leaves, to taste
  • Plain yogurt, to taste
  • 4 naan breads, warmed
  • 1 lime, cut into wedges