If using coarse salt make sure to grind it in a mortar and pestle, so you have fine salt which mixes in well in the chivda. Grind the citric acid in a mortar and pestle to make a fine powder.
Wash curry leaves and green chilies. Pat dry with paper towels so they are completely dry.
Using a medium sieve, sieve poha and discard any powdery/small broken pieces of poha. Roast the poha, either in the oven or on stove top.
Oven Method : Pre heat the oven at 300°F (150°C). Evenly spread poha (5 cups in each) in two large baking trays (10" X 15"). Baked for 10 to 12 minutes gently mixing it half way through.
Stovetop Method : In a large, heavy bottomed pot add half of the poha. Roast on low-medium heat for 10 to 15 mins. Either gently stir the poha using a wooden spatula or toss the pot gently after every 2 to 3 mins, this will prevent the poha from breaking as you roast.
Reserve the roasted poha and allow it to cool down as you prepare the remaining ingredients.
In a small saucepan, heat oil. Adjust the heat to low, add nuts, coconut & roasted chana daal. Cook stirring constantly until the nuts turn light golden. Take out the nuts in a bowl and reserve. Wipe down the saucepan to remove any extra oil and use in the next step.
Heat oil on medium heat. Add mustard seeds and once they start popping turn off the heat. Add asafetida, turmeric, sesame seeds and curry leaves. Reserve.
Note: For a low-oil recipe, arrange the choice of nuts, sliced coconut and roasted chana daal on a baking tray and bake for 10 mins at 300°F (150°C) mixing in half way through.
Add the chilies and curry leaves in a small blender jar. Pulse a full time to finely crush the chilies and curry leaves. If you do not have a small blender, you can also finely chop the chilies and curry leaves with kitchen shears.
Heat oil on low heat in a small saucepan. Add the crushed curry leaves and green chili and cook for 1 to 2 minutes stirring constantly as it turns crisp. Make sure the heat is low so you do not burn the chilies and curry leaves. Reserve
To the roasted and cooled poha, add the fried nuts, coconut & roasted chana dal. Add the fried crushed chili & curry leaves. Add the tempering of mustard seeds, turmeric, asafetida, sesame seeds & curry leaves. Add salt, powdered sugar and citric acid. Wear cooking gloves and gently mix everything in. Allow the Chivda to completely cool down. Store in airtight containers at room temperature for upto 2 weels. Serving size is about ¾ cup.