For the arepas: 

1. In a bowl, pour the water, add salt, and dissolve. Slowly add JUANA flour while mixing the water and the flour.  
2. Once the water has been completely incorporated, knead for 2 to 3 minutes until a very soft masa is obtained. Let it rest for 5 minutes. 
3. Divide masa into 10 masa balls of approximately 3 ounces each. Pat with your hands each one of the masa balls to form a patty (arepa).  
4. In a pan at medium heat, cook arepas on both sides until completely cooked. 

For the filling:  

1. Slice arepas horizontally halfway and spread some butter. 
2. Fill each arepa with black beans and grated white cheese.