Clean and trim the strawberries. Chop into smaller pieces for easier blending if using an immersion blender. Add rhubarb syrup and blend until smooth. Pour about 5 cl (1,7 fl.oz) of the fruit purée in each glass.
Gently top with Prosecco by pouring it over the purée. The sparkling wine will froth, so you may need to do this step in 2 takes, allowing the first foam to deflate. Aim for having around 1/2 to 3/4 of the glass full of the actual cocktail, the rest being foam. Add a fresh strawberry to the rim of the glass and serve immediately.
Notes
The foam does not last long, and it's a fun addition to the visuals of the cocktail. For best results, pour the Prosecco in last, just prior to serving. If serving this cocktail to a larger party, prepare in advance the fruit purée in each glass and proceed to top with Prosecco only when the guests are ready to take their servings.Please notice that the nutritional information shared in this recipe card is made by an online calculator and meant as a guideline only.