First boil water to soak the sea moss. Place sea moss in a bowl (or in blender jar). Cover with the boiled water and let sit for about 10 minutes.
After soaking, add the remaining ingredients to a high-speed blender (starting with 2/3 cup of the milk) and puree.
You may need to stop to scrape down the blender a couple of times. As it’s coming together, add the reconsituted sea moss (it will be gel-like) and blend. If it’s too thick and not blending, add the remaining milk.
Blend until fully smooth. Taste, and add extra sweetener if desired, or milk if desired (note that the pudding will thicken a little more with refrigeration).