PLACE avocado, evaporated milk, sugar and lime zest in blender container; cover. Blend for 30 to 45 seconds until smooth.
SERVE in tall glasses. Top with crushed ice, if desired.
NOTE: If a thinner drink is desired, blend in 1 cup ice cubes with drink ingredients.
* May use 2 cans (12 fl. oz. each) CARNATION Evaporated Fat Free Milk instead of Evaporated Lowfat 2% Milk.