Add matcha to a bowl with warm water, mix well.
Cold cucumber soup
Place cucumbers into a blending cup with all ingredients up to and including the salt, add the matcha stock, purée until fine, cover and leave to cool for approx. 1 hour.
Mix the wasabi and lime juice well in a large bowl. Add the melon, mix, season with salt.
Place melon salad on a shallow bowl, add the cucumber and matcha soup, garnish with cress.