Combine the calabash, chana dal, turmeric, and water in a pressure cooker. Seal the pressure cooker and cook at high pressure for about 20 minutes. Reduce heat to low and simmer another 3 minutes. Remove from heat and allow the pressure to release naturally.
Heat the oil in a large saucepan. Fry the red chile peppers and cumin seeds until the seeds begin to splutter; add the ginger and garlic to the mixture and cook together 1 minute more. Stir the calabash mixture, ground red pepper, sugar, and salt into the mixture; bring to a boil, reduce heat to low, and cook another 5 minutes before serving.
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