Follow these steps to make the Sweet Dahi

• In a vessel, add 500gms Curd
  
• Add the 1/2 cup sugar and whisk it until smooth. If you don't like the curd too thick, you can add water.
  
• Once smooth, cover the vessel and place it into the refrigerator to chill
  

Follow these steps to make the Vadas

• Wash the Urad Dal till the water runs clean and soak it in 1 cup water for about 4-5 hrs
  
• After 4-5 hrs drain out all the water and add the Urad Dal into a mixer grinder and do not add any water to and rotate it
  
• After you've rotated, if you see the paste coarse like this, add just 1 tbspn water, little by little and rotate

  Note: Don't add the water all at once or else the paste becomes runny
• The paste should a smooth paste with absolutely no coarse grains
• To this, add the chopped ginger, green chilly, salt and Curry leaves and mix it well with a spoon
  
• We go ahead and fry the vadas
• Pour oil in a skillet and place it on medium flame
• Keep a large bowl of water(for soaking the vadas after frying), a small bowl of water(for dipping the spoon each time with which we scoop the Vada batter and put it in the oil) and the Vada batter
  
• Once the oil is hot, dip the spoon into the small bowl of water and take about half a spoon of the Vada batter and gently place it in the oil forming round shapes

  Note: DO NOT take too much batter where the vadas become very big. Because after soaking them in water, they're going. To get bigger
  
• It takes about 7-10 minutes for the vadas to get cooked

  Note: if the gas to too fast it will not get cooked from the inside and if the gas is too low, the vadas will break in the oil 
• Once the vadas are ready, dip them into the large bowl of water
• Follow steps 9, 10 and 11 till all the Vada batter is complete
• Allow the vadas to completely cool at room temperature inside the water

Follow these steps for making the Sweet Dahi Vadas

• Once the vadas have cooled completely, take the sweetened curd out of the refrigerator 
• With your hand, Squeeze out all the water from the Vada and place it inside the vessel with sweetened curd
  
• Follow the same steps and place all the vadas into the sweetened curd
  
• With the help of a spoon, soak in all the vadas into the sweetened curd
  
• Sprinkle some Red Chilly Powder, Cumin Seed Powder and Chaat masala, cover the vessel and place it inside the refrigerator until chilled
• At the time of serving, transfer them into individual serving bowls and Garnish with Red Chilly powder, Cumin powder, Chaat masala and a tadka of Mustard seeds and Curry leaves and serve it chilled

Follow these steps to make the tadka

• Take a tadka pan and add 1 tspn oil and place it on medium flame
• As soon as the oil turns hot, throw in the mustard seeds and allow it to crackle

  Note:

  The best way to check if the oil is hot is by dropping in one or two mustard seeds inside the oil

  If the oil isn't hot, the mustard seeds won't sputter(crack open) and they will taste bitter
• Add in the curry leaves and turn off the flame immediately so that the curry leaves don't turn brown

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