1. Step
Heat oil in a large heavy pot over medium-high heat. Add carrots, fennel and onion; cook, stirring occasionally, until starting to soften, about 5 minutes. Add garlic, coriander and salt; cook, stirring constantly, until fragrant, about 1 minute. Add broth and tomatoes; bring to a boil. Add cabbage; reduce heat to medium. Cook, stirring occasionally, until the cabbage is tender, 20 to 25 minutes.