Linscurry med sötpotatis

In a nonstick Dutch oven (5-quart pot with a tight-fitting lid), heat oil over medium heat. Add onion, and cook, stirring frequently, until softened, about 7 minutes.

Add curry powder; cook, stirring constantly, 1 minute. Stir in sweet potatoes, cauliflower, lentils, tomatoes and their juice, and 1 1/2 cups water; season with salt.