Heat oil in a frying pan over medium-high heat.
Add onions. Saute, stirring occasionally, for about 2-3 minutes or until browned.
Add garlic, ginger and green chilies. Saute, stirring, for about 1 minute or until fragrant.
Add garam masala. Saute, stirring, for 30 seconds.
Add potatoes, beef, and chopped coriander (cilantro) leaves. Stir to combine.
Season with salt. Heat through.
Let the mixture cool to room temperature.
Roll out lemon sized balls from the mixture. Flatten slightly to make rounds or ovals.