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1. Make the dosa batter: Put rice in a bowl, rinse well and cover with 4 cups cold water. Put urad dal and fenugreek seeds in a small bowl, rinse well and add cold water to cover. Leave both to soak for 4 to 6 hours.
2.Drain rice and dal-fenugreek mixture in separate colanders. Put rice in a food processor, blender or wet-dry grinder. Add 1 cup cold water and grind to a smooth paste. It will take about 10 minutes, and it may be necessary to work in batches. Repeat the process with the dal-fenugreek mixture.
3.Combine the two pastes in a medium mixing bowl. Whisk together, adding enough water to obtain a medium-thick batter. You should have about 6 cups. Cover bowl with a kitchen towel and set in a warm place. Let ferment until the surface is bubbly, about 8 hours. Stir in the salt. Use the batter straight away or refrigerate for later use.
4.Make the potato filling: Put ghee in a wide skillet over medium heat. When oil is wavy, add mustard seeds and cumin seeds. Wait for seeds to pop, about 1 minute, then add red peppers and onion. Cook, stirring until onions have softened, about 5 minutes.
5.Add potatoes and 1/2 cup water. Cook, stirring well to combine, until liquid has evaporated, about 5 minutes. Mash potatoes a bit with the back of a wooden spoon. Season well with salt, add cilantro, then set aside at room temperature.
Making Of Masala Dosa