Trim bulbs from onions at point where stems begin to turn green.
Trim remaining stems to a length of about 4 inches, cutting off
tops if necessary. Reserve bulbs and remaining tops for another
use. Using sharp scissors, cut each section of the green stems lengthwise
into very thin strips down tot he beginning of the stem. Cut about
6 to 8 strips in each stem section.
Fill a medium-size bowl about
half full of cold water. Place scallions in water. Add ice cubes.