PreparationFor beans Place beans and next 5 ingredients in processor; blend to chunky puree. Heat oil in heavy large saucepan over medium heat. Add bean mixture and 1/2 cup reserved bean liquid. Stir over medium- low heat until warmed through, adding more bean liquid if dry, about 5 minutes. Season with coarse salt and freshly ground black pepper. DO AHEAD: Can be made 1 day ahead. Cover; chill. Rewarm before using. For fennel and chicken: Brush fennel slices with 1 1/2 tablespoons oil; sprinkle with salt and pepper. Heat heavy large skillet over medium-high heat. Add fennel slices. Sear until lightly browned and crisp-tender, 2 to 3 minutes per side. Transfer to plate. Cut into strips. Reserve skillet. Using rolling pin, flatten chicken between sheets of plastic wrap to 1/4- to 1/3-inch-thick cutlets. Spread out coriander seeds on sheet of foil. Sprinkle chicken with salt and pepper; coat with coriander seeds. Heat 4 1/2 tablespoons oil in reserved skillet over medium-high heat. Working in batches, if necessary, add chicken to skillet. Sauté until cooked through, about 3 minutes per side. Transfer to work surface. Cool 5 minutes. Cut chicken in half lengthwise, then crosswise into 1/3-inch-wide strips. Assembly: Top each tostada shell with beans, lettuce, radishes, fennel, chicken and cilantro sprig. Serve with lime wedges.
PreparationFor beans Place beans and next 5 ingredients in processor; blend to chunky puree. Heat oil in heavy large saucepan over medium heat. Add bean mixture and 1/2 cup reserved bean liquid. Stir over medium- low heat until warmed through, adding more bean liquid if dry, about 5 minutes. Season with coarse salt and freshly ground black pepper. DO AHEAD: Can be made 1 day ahead. Cover; chill. Rewarm before using. For fennel and chicken: Brush fennel slices with 1 1/2 tablespoons oil; sprinkle with salt and pepper. Heat heavy large skillet over medium-high heat. Add fennel slices. Sear until lightly browned and crisp-tender, 2 to 3 minutes per side. Transfer to plate. Cut into strips. Reserve skillet. Using rolling pin, flatten chicken between sheets of plastic wrap to 1/4- to 1/3-inch-thick cutlets. Spread out coriander seeds on sheet of foil. Sprinkle chicken with salt and pepper; coat with coriander seeds. Heat 4 1/2 tablespoons oil in reserved skillet over medium-high heat. Working in batches, if necessary, add chicken to skillet. Sauté until cooked through, about 3 minutes per side. Transfer to work surface. Cool 5 minutes. Cut chicken in half lengthwise, then crosswise into 1/3-inch-wide strips. Assembly: Top each tostada shell with beans, lettuce, radishes, fennel, chicken and cilantro sprig. Serve with lime wedges.