Frozen Lemonade Cooler

Ingredients:
- 2 cups lemon sherbet
- 1 (6 ounce) can frozen lemonade concentrate
- 3 cups water
- 1 teaspoon lemon zest

Directions:
- Add all ingredients to the container of an electric blender.
- Blend on high speed for 20-30 seconds or until smooth.
- Serve immediately in chilled glasses.