This gentle, cumin-scented soup is topped with sweet caramelized onions, a drizzle of high-quality olive oil, and a blast of fresh lemon juice. It’s incredibly easy and surprisingly delicious considering how inexpensive it is to make. You don’t have to soak lentils because they are lower in phytic acid, but you’re welcome to soak your lentils in warm water for 8 to 18 hours.