Once roasted, remove from flame/oven and let it cool down a bit before you peel off the burnt skin and remove the stem of the eggplant.
In a mixing bowl mash the eggplant using fork and let it cool down completely.
In a food processor add peanuts and process twice until it breaks down into tiny pieces. Remove it in a bowl of mashed eggplant and in a same food processor bowl finely process green chilies, garlic and ginger. Add it to the eggplant mixture along with 3 cups of Greek yogurt. Season with salt and mustard. Add chopped cilantro and mix well.