1 Rinse cilantro, shake dry and pluck leaves. Rinse scallion, pat dry and cut into thin rings.
2 Halve avocados and remove pits, then scoop flesh into a blender along with cilantro and scallion.
3 Squeeze juice from lime. Add 3 tablespoons juice, wasabi paste, kefir and yogurt to the avocado mixture.
4 Purée in a blender (or with an immersion blender), gradually adding ice cubes. Season with salt and pepper, pour into glasses and serve.