Heat oil in a Dutch oven over medium-high heat. Add cardamom, cloves, and garlic to pan; cook 30 seconds, stirring constantly. Add onion; sauté 8 minutes or until tender. Add chili powder, turmeric, and coriander; cook 30 seconds. Add beans and chicken; stir to coat. Add milk, 1/2 cup water, lemongrass, tomatoes, and potato to pan. Cover, reduce heat, and simmer 30 minutes or until potato is tender. Serve with cilantro.