While water is heating up, place 2 cups of cassava flour in a bowl. Slowly add 1/2 cup of cold water and mix together with a whisk until smooth. Set aside.
Once the water is boiling, slowly pour in the cassava flour mixture while continuously stirring. Reduce heat to medium.
Using a wooden spoon or whisk, vigorously stir and mash the mixture for about 10-15 minutes. It will become stretchy and sticky. If too dry, add more hot water a few tablespoons at a time.
Cover pot and allow to rest for 8-10 minutes.
Uncover and briefly knead funge for a minute until smooth. For softer funge, mix in butter or oil while kneading.
Shape into round balls or a loaf. Serve warm with desired sauces, stews or proteins. Enjoy!