Wash the mizuna thoroughly and cut into bite-sized pieces. Quickly boil the pork slices, then cool them in ice water and drain well. Mix together the sesame dressing, mentsuyu, and ground sesame seeds in a bowl.

Cook the pasta according to package instructions. Rinse under cold water to cool (using ice water makes it even better).

Combine the mizuna, pork, and pasta in a large bowl. Add the dressing mixture and toss everything together until well mixed.