In a pan/wok, heat oil, add dry red chili, garlic, saute for 2-3 min. Add turmeric powder, saute for a min.
Add fenugreek leaves, ginger, and mix well. Saute for 3-5 min.
Add potatoes, coriander powder, dry mango powder, red chili powder, salt to taste. Mix well. Cover and cook on medium to low heat, until potatoes are cooked through, around 7-10 min. Keep stirring occasionally.
Add lemon juice, chopped green chili (optional), fresh cilantro, mix well. Serve hot. Enjoy!!