Pineapple Daiquiri

1/2 large fresh pineapple
1 (6 ounce) can pineapple juice
1/2 cup light rum
1/2 (6 ounce) can frozen limeade concentrate
1 cup crushed ice

Remove pineapple from shell; core and cut fruit into chunks. Freeze until firm. Mix half of pineapple chunks, pineapple juice, rum and limeade in blender. Whir at high speed until blended. Add remaining pineapple and ice. Blend until frothy.