Sardine's sardine

Remove the sardine tail that has been opened by hand and cut it into bite-sized pieces.

Peel the udon skin, turn it into pieces, and then soak it in vinegared water (not included) for a few minutes to remove the lye.

Combine the seasoning ingredients and melt the miso. Add drained udon to this and mix it in roughly, then add sardines and gently mix to prevent the flesh from fading.

Place it in a bowl and place mustard on top and it's finished.