Cook Barley: Combine barley, pinch of turmeric, salt and 21/2 cups of water in a saucepan, bring to a boil, reduce the heat, cover and simmer till barley is tender, about 35~45 minutes. Set aside until ready to use.
Heat 2tbsp oil in a pan, add chana, urad dal, peanuts and mustard seeds. Once the mustard seeds start to splutter, add asafoetida, curry leaves and green chilies, cook for 1 minute.
Add the tempering to the cooked barley and season with salt. Add lemon juice and mix well to combine. Serve warm or at room temperature.