To make the margarita cookies:
- Using a #2 tip, outline the cup and stem of the margarita glass in white.
- Using a #2 tip, pipe a lime rind on one corner of the glass. (AmeriColor Leaf Green)
- Thin both white and light green icing with water until they reach the consistency of syrup, cover with a damp dishtowel and let sit several minutes (AmeriColor Leaf Green).
- Stir the green icing gently with a rubber spatula to break any bubbles on the surface and transfer to a squeeze bottle.
- Fill in the majority of the glass with green flood icing to just underneath the rim of the glass.
- Fill in the lime wedge.
- Stir and transfer white icing to a squeeze bottle. Fill in the top of the glass with white (touching the green), making a somewhat wavy line. for a frosty glass look.
- Fill in the stem of the glass in white.
- Let dry overnight.
- Using warmed corn syrup or a mixture of meringue powder and water, paint a line across the top piping on the glass with a small paintbrush.
- Sprinkle with clear sparkling or sanding sugar to make the salted rim. Shake off any excess.