Rani is a study in contrasts. The spicy pinch of lamb vindaloo meets the sugary melt of mango chutney, and the taste of sour curry is followed by the sweet nectar of a rose lassi. No taste bud is ignored at Coolidge Corner’s hottest new bistro. The atmosphere is airy and pleasant, with authentic décor to match the authentic Hyderabadi cuisine. And the service is as steady as the stream of locals coming through the door.