In a large mixing bowl stir together the whole wheat flour, all-purpose flour, and the salt. Add 3/4 cup of the warm water while mixing constantly with your hands till the dough is moist. Add the remaining water, 1 tbsp at a time, mixing constantly with your hands. Keep working the dough till the dough forms a ball and holds its shape. (The dough will be stiff).
Dampen your hands. Keep the dough in the mixing bowl to knead. Knead in an additional 2 tbsp all-purpose flour, if necessary, to make a moderately stiff dough. Knead dough till smooth and elastic (8 to 10 minutes). Continue dampening hands, as needed, during kneading. The dough is ready for shaping when you can lightly and quickly press two fingertips 1/4 inch into the dough and the dough springs back.
Shape the dough into a ball. Cover the bowl with a damp towel. Let the dough stand in a warm place for 30 to 60 minutes.
Turn the dough out onto a lightly floured surface. Knead dough 1 to 2 minutes more. Divide the dough in half. Form each half into a 12 inch long roll. Cut each roll into 12 one-inch pieces. Flatten each piece of dough with the palm of the hand.
Sprinkle some flour over the flattened balls. Cover with plastic wrap. Let rest for 30 minutes.
On a well floured surface roll the flattened ball into a circle 7 to 8 inches in diameter, turning the dough over once and firmly pressing and stretching the dough with the rolling pin.
Roll around the rolling pin, and transfer to a hot, greased griddle or heavy skillet. Cook over medium heat about 1/2 to 1 minute or until tiny brown spots appear. Using tongs, turn and cook 30 seconds more. Remove from heat; Brush with Usli Ghee or melted shortening. Repeat with the remaining balls.
Stack the hot Chapati in a napkin-lined breadbasket to keep warm. Serve immediately.