Step 1: Prepare Your Glassware – The Frosted Rim
Begin by chilling your glasses—tall Collins glasses or sturdy mason jars work perfectly. To create a festive sugar rim, take a lime wedge and run it around the rim of each glass. Dip the moistened rim into a plate of coarse sugar or colored sanding sugar, twisting to coat evenly. Set the prepared glasses aside.

Step 2: Juice Your Citrus
This is the most important step for flavor. Roll your lemons and limes firmly on the countertop with the palm of your hand to break down the inner membranes and maximize juice yield. Juice them using a citrus juicer until you have 1 cup (8 oz) of each fresh lemon and lime juice. Strain the juice to remove any seeds or large pulp.

Step 3: Combine All Liquid Ingredients
In a blender pitcher, combine the 1 cup of vodka, 1/2 cup of triple sec, 1/2 cup of your chosen sour schnapps (e.g., Sour Apple Pucker), the 1 cup of fresh lime juice, the 1 cup of fresh lemon juice, and the 1 1/2 cups of simple syrup. Give it a quick stir with a long spoon to combine.

Step 4: The Layered Blend for Perfect Texture
Add about 3 cups of the ice to the blender pitcher, covering the liquid. Secure the lid tightly. Start blending on a low speed to break down the ice, then gradually increase to the highest speed. Blend until the mixture is a smooth, thick slush. If the blender struggles, add a splash of water to help it along.

Step 5: Incorporate Remaining Ice
With the blender still running on a medium setting, carefully remove the lid’s feed cap and slowly add the remaining 3 cups of ice through the opening. This two-stage blending method ensures a consistently smooth slush without overworking your blender’s motor.

Step 6: Achieve the Perfect Consistency
Blend for another 30-60 seconds on high, until the entire mixture has a uniform, fine, and spoonable slush consistency. It should be thick enough to mound on itself but fluid enough to pour. If it’s too thick, add a little more citrus juice or water. If it’s too thin, add more ice and blend again.

Step 7: The Grand Finale – Pour and Garnish
Immediately pour the vibrant slush into your prepared, sugar-rimmed glasses, filling them to the top. For the final, playful touch, garnish the rim with a wheel of lime and lemon. For the ultimate thematic flourish, drape a sour gummy worm over the edge of the glass or let it peek out from the center of the slush. Serve immediately with a wide straw and a spoon.