Keep Idli steamer on boil, grease moulds and keep them ready. Mix flours together with salt and citric acid, now add water till you get thick batter. Add eno fruit salt and mix well, scoop a tbsp or 2 and pour on each mould. Keep the mould stand in steamer and boil idlis for approx 10-15 mins till done. Remove the mould stand and let it cool a bit, separate idlis on platter.
When all done serve with sambhar

Sambar:
Boil soaked tur daal in water, salt and turmeric powder till soft and mushy. Can blend daal with water. Make vaghaar of urad daal let it brown up then add mustard seeds, garlic, fenugreek, curry leaves and red chillies let it splutter and add onions saute till pinkish colour then add tomatoes and spices, saute till paste like, add drumsticks and little water cook it till done then add tamarind pulp and tur daal with a cup or 2 of water depending how watery you prefer.

Let it boil once remove from flame garnish with chopped coriander leaves