Preheat oven to 350°F.
Finely dice the rhubarb and place in a medium to large mixing bowl.
Skin the peaches, remove the pit, and roughly chop. Add to the mixing bowl with the rhubarb.
Sprinkle the xanthan gum, Truvia sweetener, salt, and psyllium husks on the rhubarb and peach mixture.
Stir well.
Pour over the refrigerated crust.
Let sit at room temperature for about 10-15 minutes.
Bake for 25 minutes - meanwhile ...