Hiyayakko (Japanese Cold Tofu)

Bahan-bahan (4 porsi)

• 14 oz soft/silken tofu (kinugoshi dofu) ((1 pack, chilled))
• 1 g reen onion/scallion
• ½ tsp ginger ((grated; from a 1-inch, 2.5-cm knob))
• 4 shiso leaves (perilla/ooba) ((optional; for decoration))
• 2 Tbsp katsuobushi (dried bonito flakes) ((skip for vegan/vegetarian))
• soy sauce