Soak the sunflower seeds in water for about 1-2 hours.
Drain the sunflower seeds, fill them in the blender and add 2/3 cup fresh water, lemon juice, lemon zest, salt and cilantro. Blend in a high-speed blender until completely smooth for about one to two minutes. If it's too thick, you can add more water and blend it again.
Pour the dip in a container and place it in the fridge for about half an hour, because it may have gotten warm due to the blending. After that you can enjoy it with your favorite snacks.
Storage: You can store this dip up to two to three days in the fridge.