2.Outline the margarita glass in white piping consistency icing, creating definition between the different parts as shown.
3.Outline the lemon slice in yellow piping consistency. Then, outline an elongated oval in the upper third of the glass. This will be the top of the "liquid" in the glass, so leave some space at the top of the glass for details.
4.Flood the top part of the glass with white flood consistency icing. While the flood is still wet, gently sprinkle granulated sugar on the flood. This will add some texture, reminiscent of a salted rim.
5.While the white flood at the top of the glass is drying, flood the base of the glass with white. Then, flood the top third and bottom third of the main part of the glass with green. Let these floods dry until they are just starting to crust over.
6.Next, flood your lemon slice with yellow flood-consistency icing. While the flood is still wet, pipe a line following the contours of the slice in white flood consistency icing.
7.With a scribe tool or toothpick, gently pull the white lines inward toward the glass. This wet on wet marbling technique is very simple, but very effective when decorating citrus slices.
8.Now, fill the stem of the glass with white flood-consistency icing. Move the icing around with a scribe tool or toothpick to ensure full coverage, and also to get rid of any air bubbles.
9.Flood the remaining two areas with green flood icing, gently moving the flood around with a toothpick or scribe tool to ensure full coverage and to get rid of air bubbles. It may be helpful to flood just inside the lines, and then to gently coax your icing to the edge of the shape as you flood.
If you'd like to add more texture, outline the top of the glass with white piping consistency icing, and the three green sections with green piping consistency icing.
Cookies decorated by Julia Perugini of @juliascookiesaz