Pour 1 cup of water into a saucepan and set the heat to high. Bring the water to a hard boil and gradually stir in 1/4 cup of flour. Continue to stir as you pour in the flour to help prevent the mixture from clumping.
Reduce heat and allow the mixture to simmer for two minutes. Check for consistency. Add more flour if necessary. The total amount of flour for 1 cup of water should not exceed 1/2 cup or you will have paste so thick it won't spread.
Stir the mixture and simmer for another three minutes. A total of five minutes is the maximum simmer time. Remove the paste mixture from the heat and spoon it into a plastic container to allow it to cool. The cooling process will take between 10 and 15 minutes.