Shred all vegetables using a food processor, mandoline, or knife.
Massage vegetables with your hands, adding a little lemon juice and salt.
Blend the dressing—start with tahini, hemp seeds, lemon juice, and 1/2 cup of water. Then add garlic, salt, dill, kelp, dulse, and the remaining water, blending until smooth.
Toss the slaw with the dressing, using your hands to fully incorporate the flavors.
Taste and adjust seasonings, then enjoy immediately or store for later!