Hello and thank you for your question. Yes, xanthan gum can generally be used to thicken pureed foods. You can try adding about 1 teaspoon per cup as you are pureeing the mixture. You may need to experiment with the amount based on your preference, but using a blender ensures the xanthan gum gets incorporated without clumping.
Can I use xanathan gum to thicken pureed foods? My brother can't eat solids due to his throat issues, but sometimes his meals come out far too thin.