It is an Indian side dish made by mashing the specific vegetables from which the curry is made. The vegetable such as eggplant/aubergine is roasted, then peeled and mashed and cooked with spices as well as onion and tomato. For a potato/ aloo bharta, potatoes are roasted or boiled, peeled and mashed. Raw mustard oil and onion, green chilies are added to the mashed potato or sometimes may be added as a tempering with heated oil and green chilies.