Whisk together the tahini, oil, lemon juice, tamari, and garlic. Whisk in the water 1 teaspoon at a time until you reach your desired consistency. Pour the dressing over the kale and massage with your hands until the kale begins to soften, about 30 seconds. Add the pumpkin seeds and hemp seeds. Toss to combine. Taste and season with salt, as desired.
Transfer to an airtight container until ready to serve. (Salad can be made up to 1 day ahead.)