Add 2 tablespoons rice vinegar, 1 tablespoon shoyu or soy sauce, 1 tablespoon sesame oil, 1 tablespoon brown sugar, 3 cloves garlic, and 1 inch ginger to a food processor or blender and pulse until everything is completely blended. Continue until the dressing is emulsified, giving it a slightly creamy consistency.
Optionally, cook 200 g extra firm tofu (cubed)**. If you wish to cook the tofu, take a small pan or wok and cook half the tofu cubes on all sides until lightly browned. You can use oil or on a non-stick surface, skip the oil.
Add 1 large tomato (chopped), 80 g watercress, 60 g beansprouts, and 20 g red onion (chopped) to a large bowl. Pour over the dressing and toss to mix.
Transfer to the fridge and the tofu watercress salad sit for around an hour to let the flavours meld together.
Notes
*I like to leave half the watercress whole and cut the rest. Serving the salad on a bed of uncut watercress adds more textural diversity and lends a beautiful, show-stopping presentation.** Traditionally, Hawaiian tofu watercress salad uses raw tofu. For textural interest, I like to pan-fry half and leave the rest un-cooked. Blanching your tofu is another great way to improve the texture (it becomes firmer) without browning.