Heat vegetable oil in a medium pot over medium-high heat.
Ingredients (for 4 servings)
1 tbsp — vegetable oil • 1 medium onion, diced • 1 medium potato, cut into 1 cm cubes • 1 cup dry green lentils (soaked overnight) • 1 cup water • 1/2 tsp ground turmeric • 1/2 tsp ground cinnamon • 1/2 tsp salt, plus more to taste