In a small bowl add 1/4 cup of water and flour and mix well until it forms a thick paste. Add more flour as necessary until paste isn’t too runny and easy to work with. Place lid on pot and seal with paste, pressing into space in between lid and rim of pot. Check for no pin-size holes where steam can escape from. Transfer carefully to oven, being careful not to disturb lid from pot. Cook for 20 minutes then lower oven temp to 325. Cook for min 4 hours and up to 5 hours.