Wash the Rajma beans and boil them in pressure cooker for half an hour.  
 Take oil in a frying pan and heat it. Now add chopped ginger and onions.  
 Fry the mixture on medium flame for 3 to 4 mintues.  
 Put chopped tomatoes, turmeric powder, garam masala and salt and fry again on a medium flame.  
 Pour this fried masala into the Rajma beans and cook again till the water is almost lost.  
 Rajma is ready. Serve it garnished with chopped coriander leaves.