1-First Step: Gather and Prepare Ingredients. Begin by rinsing and chopping 2 cups of fresh rhubarb into small pieces for even blending this mise en place takes about 5 minutes. For vegan preferences, double-check that your agave syrup is from a plant-based source, ensuring the mocktail starts off adaptable.

2-Second Step: Blend the Rhubarb Mixture. In a blender, combine the chopped rhubarb, 1/2 cup fresh lime juice, and 1/4 cup agave syrup, blending on high until smooth, about 2 minutes. This creates the core flavor; for low-calorie options, substitute agave with stevia to maintain the zing without added sugars.

3-Third Step: Strain for Smoothness. Pour the blended mixture through a fine mesh strainer into a pitcher to remove any pulp, which takes another 2 minutes and results in a velvety base. This step is gluten-free naturally, so no changes are needed, but taste and adjust sweetness for dietary needs.

4-Fourth Step: Add Sparkling Water and Chill. Stir in 2 cups of sparkling water to the strained mixture for that effervescent finish, then refrigerate for 5 minutes to chill. For a personalized touch, add 1 tsp vanilla extract here, adapting for vegan diets by confirming it’s alcohol-free.

5-Fifth Step: Serve Over Ice. Fill glasses with ice cubes and pour the mocktail mixture over, stirring gently to combine. This keeps it cold and refreshing, and if you’re preparing for a group, consider portioning for low-calorie variations by diluting slightly.

6-Final Step: Garnish and Enjoy. Top each glass with a lime wedge or fresh rhubarb slice for visual appeal, and serve immediately for the best taste. This rhubarb margarita mocktail is versatile, so pair with herbal teas for added health benefits or adjust for preferences like using flavored sparkling water.