1)Saute onion and garlic in a fry pan on low heat, until onion is tender. 2)Add chilly, lime juice and potatoes. 3)Cook for 1 minute. 4)Add rest of ingredients. 5)Simmer for 10 - 15 mins, until potatoes are tender. 6)Remove to a serving plate. 7)Simmer the sauce, until sauce thickens. 8)Pour it over potatoes.