2Heat 1 1/2 teaspoons oil in a high-sided skillet over medium. Add leek and carrot; cook, stirring often, until softened, about 3 minutes. Add tomatoes, garlic, thyme, and crushed red pepper; cook, stirring constantly, until fragrant, 1 to 2 minutes. Add white wine and cook until reduced by half, about 4 minutes. Add chicken broth, beans, and 1/2 teaspoon black pepper; bring to a boil over medium-high. Reduce heat to medium-low, and simmer until tomatoes burst and carrots are tender, about 25 minutes.
3While beans simmer, line a large, rimmed baking sheet with aluminum foil. Rub fish with remaining 1 tablespoon oil; sprinkle evenly with salt and remaining 1/2 teaspoon pepper. Place half of the lemon slices in fish cavities. Place remaining slices on the prepared baking sheet. Roll 2 large pieces of aluminum foil into logs and twist to prop up fish cavity-side down.
