Combine the dried marshmallow root and water in a bowl. Let steep overnight.
Strain out the root, reserving the infused water.
Pour the infused water into a saucepan and gently heat. Reduce for about 5 minutes.
Add the honey and keep over low heat. Do not boil. Simmer gently for about 10 minutes, stirring continuously.
Whip the egg whites to stiff peaks in a separate bowl.
Slowly incorporate the hot honey mixture into the egg whites while mixing continuously.
Return the mixture to low heat and continue stirring for about 45 minutes until thickened.
Warm the almonds in a 350°F oven for a few minutes, then stir them into the mixture.
Transfer to a greased or parchment-lined dish.
Allow to cool and set for at least 6 hours before cutting.