If you have a Japanese grocery nearby you should be able to get nicely marbled meat pre-cut into thin slices, but if you don't you could have your butcher do it for you. If you have a sharp knife and better knife skills than I, you could do this yourself in theory, but you'll want to partially freeze the meat I should warn you that it's very hard to get thin uniform slices.

Cut the daikon lengthwise into thin batons, using a mandoline speeds this up. Soak them in a large bowl of ice cold water for about 10-15 minutes to take the "bite" off and bring out the sweetness.

Bring the dashi to a boil and using chopsticks or tongs, swish one or two slices of meat around at a time for a few seconds. Because it's pork you need to cook it all the way through, but it should just barely be cooked. Transfer to a paper towel lined plate to drain and cool too room temperature.

Whisk all the dressing ingredients together. Transfer the pork to a bowl and pour about half the dressing over the meat and stir to combine. Drain the daikon and toss with some of the dressing. Toss the greens with some dressing and then assemble your salad.