Make your marshmallow root tea. Steep 1 tablespoon of marshmallow root in ½ cup of hot water for about 5 minutes. Strain out the root and set the tea aside. This is your base liquid, standing in for plain water and carrying a subtle, earthy sweetness and adding all of the wonderful benefits of marshmallow into the fluff.
Bloom the gelatin. In the bowl of your stand mixer, add ¼ cup of water and sprinkle 1 tablespoon of gelatin evenly over the top. Set it aside to firm up while you prep everything else. Attach the whisk to your stand mixer for later.
Heat the honey. In a medium stainless steel pot, combine your marshmallow root tea with the honey.
Whip it up. With the mixer running on low, slowly and carefully pour the hot honey marshmallow root mixture into the bloomed gelatin. Once it's all incorporated, increase the speed to high and whip.
Be patient. This is the part that surprises people, it takes longer than you'd think to whip into fluff. Even with a strong stand mixer, expect 15 minutes of whipping. The exact time depends on your mixer's strength, so don't rush it. You're looking for stiff peaks: thick, glossy, and holding its shape when you lift the whisk.
Add your flavor. Once it's thick and fluffy, add the vanilla bean paste (or orange blossom/rose water, if using) and whip briefly to combine.
Store and enjoy. Spoon the fluff into a glass container and store in a cool, dry place for up to two weeks. Use it as a dip for fruit or graham crackers, swirl it into hot chocolate or butterfly pea latte, or eat it straight off the spoon. Enjoy!