In a large bowl, mix the flour, salt, sugar and 1/4 cup of the ghee. When the mixture comes together in a ball, add the milk and water. Knead for about 5 minutes to form into a smooth, elastic dough.
Divide into 8 balls, coat with ghee, cover with a damp cloth and let rest at room temperature for at least 5 hours.
To cook, heat a frying pan on low heat. Roll out the dough ball as thinly as possible so you can see through it. Either disc-shaped or square is fine. Fold the edges in to meet in the middle like an envelope. Drizzle some ghee in the pan and cook the prata dough 3-4 minutes per side until golden brown.
Serve with a tangy curry or sugar.