In a large bowl, mix together the cornmeal and salt, Pour in 2 ½ cups of the boiling water and mix with a wooden spoon to form a mass. Cover with a towel or plastic wrap and set aside to rest for 5 to 10 minutes. Form into 2 inch disc shapes, melt butter in a non-stick skillet, cook arepas on medium high heat until both sides are golden brown. Serve with warm maple syrup..