Pulse the ingredients under the section "Make a Coarse Powder" in a blender to a coarse powder.
To this drain & add dal. Grind to a coarse mixture without adding water.
Transfer the dal mixture to a bowl and add ingredients under the section "Other ingredients" & mix well.
Heat oil in a deep pan over medium heat to smoking point.
Wet your hands and remove a walnut size portion of the mixture, form a ball and gently flatten it.
Slide the vada into hot oil. Repeat the process for 3 or 4 vadas.
Increase the heat to medium, deep fry until golden brown on both sides.
Drain on to a paper towel.
Repeat the process with the rest of the mixture.
Serve masal vadai hot with tea or coffee.