This comforting vegan lentil stew is incredibly satisfying thanks to hearty lentils and sweet potato. The leeks provide a savory allium note while the tomato paste, miso and cumin add bold flavor.
Heat 1 tablespoon oil in a large Dutch oven over medium-high heat. Add sweet potato; cook, stirring occasionally, until lightly browned and beginning to soften, 6 to 8 minutes. Add leeks and carrots; cook, stirring occasionally, until softened, 3 to 4 minutes. Stir in garlic, tomato paste, cumin, miso and the remaining 1 tablespoon oil; cook, stirring constantly, until fragrant and the tomato paste has darkened, about 1 minute.
Add water, lentils and salt; bring to a boil over high heat. Reduce heat to medium-low; cover and cook until the lentils are almost tender, 25 minutes. Stir in greens; cover and cook until the greens are wilted, about 10 minutes.
Refrigerate in an airtight container for up to 1 week or freeze for up to 3 months.