Slice the cucumbers lengthways, use a teaspoon to deseed them, then holding the lengths together, slice them into 1cm pieces, transfer them to a strainer over a tray, and sprinkle salt over them.
Transfer the shredded cabbage, finely sliced scallions/spring onions, grated fresh ginger, finely sliced roasted seaweed or nori sheets, and black and white sesame seeds, to a large mixing bowl, and combine.
Make the dressing by adding the Shichimi Togarashi Japanese Seven Spice, Japanese sesame oil, Japanese soy sauce, Japanese rice vinegar, and mirin to a jar with lid, screw the cap on, and shake the jar.
Squeeze any excess liquid from the cucumbers, transfer them to the salad bowl, pour on the dressing, and use a salad spoon to thoroughly combine the ingredients.
Taste, adjust the seasoning if needed, transfer to a salad bowl, sprinkle a pinch of sesame seeds on top of the salad, and serve.