In a mixing bowl, combine wheat flour, rice flour, grated jaggery and salt. (You can also use melted jaggery - in a small saucepan, add grated jaggery and a little water, around ¼ cup. Heat on low until the jaggery melts completely, stirring occasionally. Strain and let it cool slightly. Then add to the jaggery syrup to the dry ingredients).
Add water gradually to reach a smooth, thickish but pourable batter consistency
Heat a dosa pan or non-stick skillet over medium heat.
Lightly grease the pan with ghee or oil.
Pour a ladleful of batter in the center.
Cook until golden brown on one side (around 2-3 minutes). Drizzle a little ghee or oil around the edges.
Flip and cook the other side until cooked through.
Remove onto a plate.
Repeat with the remaining batter.
Serve Bellam Attu hot, drizzled with a little extra ghee if desired.