Preheat oven to 375 degrees F.
Line a backing sheet with parchment paper.
In a medium bowl combine the almond flour and xanthan gum. Whisk until fully mixed then add the water and olive oil. Then add the nut crumbs and parmesean cheese. Knead the dough until the almond flour has been completley worked in. Divide into four.
Place one of the balls of dough into the center of a piece of wax paper. Cover with another piece of wax then roll the dough out into a circle. Remove the paper and cut the dough into a perfect circle. You can patch the dough, re-roll and cut again into a perfect circle. It should be between 6-7" in diameter.
Spread 1 tbsp of pizza suace around the circle; leave about 1/2" from the edge all the way around. Place 1/3 cup of the meat/cheese mix onto half of the circle.
Fold the wax paper with the empty side of the circle right over so that the edges of the calzone perfectly match. Pinch the edges together, remove the top wax paper and fold up the dough edge, just once. to form a solid crust.
Remove the bottom wax paper to free the calzone and place onto the prepared baking sheet. Continue with the other three. Back at 375 degrees from 13 - 15 minutes until the edges start to brown.