Make a masala paste by grinding mustard, cumin seeds and garlic cloves with presence of water in a grinder. Wash and peel the outer skin of ridge-gourd. Cut them into small pieces. Heat the oil in a frying pan. Fry the chopped onion till it becomes golden-brown. Add the vegetable pieces and stir well. Then add the masala paste and salt to it. Stir well. Cover the pan with a lid and keep it on low flame. When about