firstly, chop the cucumber finely and keep it aside.
further in a small blender add coconut, mustard seeds, red chillies, salt and tamarind together.
blend to a fine paste adding water as required.
add finely chopped cucumber to grounded coconut paste.
mix the coconut paste and cucumber well.
furthermore, heat a kadai add coconut oil, mustard seeds, urad dal, broken red chilly and curry leaves.
when the mustard seeds splutter pour the seasoning to the saasmi.
finally, serve cucumber saasmi along with hot rice or with dosas and idliy's.