Add ingredients to a blender and process until smooth. Ice may be added but do this slowly as the cucumber is full of water and the lassi has the potential to become thin on you.
Notes
If the jalapeno is a point of dispute you may leave it out altogether. This makes for a just as delicious alternative. Alternatively you can add half the jalapeno instead of the whole one for heat variant.
Recipe by Rooting The Sun at https://rootingthesun.com/cucumber-mint-lassi-with-jalapeno/