After measuring powdered sugar sift it into a mixing bowl.

Add egg whites and lemon juice and beat using a paddle attachment on low speed. Once all ingredients are combined mix on high speed for seven minutes or until royal icing is thick and holds its shape.

Divide the icing into bowls – 2/3rd in one bowl, 1/3 in another.

Add green food coloring to the 2/3rds of the icing, and mix until you get the desired color. Slowly add water, 1 tsp at a time, until the icing is smooth and you can dip the marshmallows.

Add black food coloring to the 1/3rd bowl. Mix until you get the desired color. Cover with plastic wrap, pressing the plastic directly onto the icing. Set aside until ready to use.

Place a lollipop stick into each marshmallow. Dip marshmallows into green icing, shake off excess, and use a knife to smooth if necessary. Let the icing harden completely.

Once the green icing is dry, place a small dot of black icing on the back of each eyeball, and place on the marshmallow. Hold until the eye does not move.

Place the black icing in a piping bag with a small round tip (size 2 or 3 decorating tip). Pipe a mouth, scars, and hair.

Let harden completely before serving.