Line an 8x8 baking pan with parchment paper, and lightly grease the surface. Sprinkle a light layer of pumpkin pie spice.
In a stand mixer or a large bowl (if you are using a handheld mixer), whisk together pumpkin puree and gelatin. Set aside to hydrate while you heat up the syrup in the next step.
1/2 cup pumpkin puree, 2½ tbsp grass-fed gelatin
In a large saucepan, heat water and honey over high heat. Bring to a boil for 10-15 minutes until the temperature on the thermometer reads 240 degrees.
1/2 cup water, 1 cup honey
Once the mixture hits 240 degrees F (do NOT exceed 245 degrees), remove from the heat, turn on the mixer to low, and slowly pour over the gelatin mixture.
Add vanilla extract and pumpkin pie spice and increase the speed to high. Beat for 5-6 minutes until the mixture gets lighter in color and triples in size. The texture should be whipped, hold its shape for a bit before falling back on itself.
1 tsp vanilla extract, 1 tsp pumpkin pie spice
Working quickly, pour the mixture into the prepared pan, and smooth the top with a spatula.
Let this sit for at least 3 hours at room temperature to set completely.
When ready to slice, remove the marshmallow from the pan using the parchment paper. Grease a sharp knife on both sides, and slice into desired size (I like to cut into 36 squares).
Coat each piece in arrowroot starch (you can add a few shakes of more pumpkin pie spice if desired), and enjoy!
3 tbsp arrowroot starch