Description : Lyangcha sweets at a village fair. Langcha, also known as Lyangcha or Lemcha, is an Indian sweet dish prepared in India and Bangladesh. Langcha is made from flour and milk powder that is fried and dipped in sugar syrup for a long time. The Government of West Bengal has begun the process of registering Geographical indication (GI) for Lyangcha. Tehatta, West Bengal, India.