In a large cast iron pot, melt the butter over medium heat
Add the onions and sauté until translucent
Add the ginger, garlic and red chilli. Sauté this until fragrant.
Now add the tomatoes, and stir this mixture until all the water evaporates from the tomatoes.
Make sure all the water is removed from the soaked dal, and pour the dal into this mixture. Sauté the dal with the tomatoes for a minute
Sprinkle the Dal Tadka Masala over this, add the lemon juice and 1/4 tsp of the salt. Mix this thoroughly. Now, the flavoring of the dal is complete. You would need to divide this mixture into half. Place one half of the mixture in a bowl and set aside. The other half of the mixture should remain in the cast iron to make the liquid dal for the risotto.
With the remaining dal mixture in the cast iron, add the water, salt and and mix it all together for about 30 seconds.
Place the lid on the pot and let this cook for 10 minutes on LOW heat.