Easy aloo dhansak

Name: Easy aloo dhansak
Prep time: 5 min
Cook time: 30 min
Total time: 35 min
Cuisine: Asian, Indian
Ingredients: 2 tbsp vegetable oil (from your storecupboard); ¾ large onion, finely chopped; 1½ tbsp medium curry powder; 3 carrots, halved if large, chopped diagonally; 1.1kg Maris Piper potatoes, peeled and chopped; 1 vegetable stock cube (from your storecupboard); 200g leftover cooked lentils; Coriander leaves, to garnish (optional); 1 lime, cut into wedges, to serve (optional)