Thinly slice ¼ daikon radish and then cut it into matchsticks.
Place them in a bowl and sprinkle with ½ tsp salt. Massage until evenly covered and sit for 5 minutes to draw out the excess moisture.
Pour all of the dressing ingredients (1 tbsp Japanese soy sauce (koikuchi shoyu), 1 tsp sugar, ½ tbsp toasted sesame oil, ½ tbsp olive oil, ½ tsp lemon juice, ½ tsp garlic paste, ½ tbsp toasted white sesame seeds and 1 pinch ground white pepper ) into a small bowl and whisk until smooth.
Once 5 minutes have passed, thoroughly squeeze the daikon to release the water and discard the liquid.
Mix 70 g canned tuna and 1 tbsp Japanese mayonnaise into the daikon.
Transfer to serving bowls and drizzle with the dressing. Garnish with bonito flakes (katsuobushi) and kizami nori (shredded nori) to taste. Enjoy!