Indian Root Vegetables

Heat oil in a large lidded frying pan over medium-high heat. Add chiles and mustard seeds to the hot oil, and let crackle for about 15 seconds. Add ginger and garlic and cook until fragrant, about 15 seconds more; do not burn the garlic. Add onion and saute until lightly brown, 3 to 5 minutes. Add chili powder, turmeric, and garam masala; mix well.

Add yam, sweet potato, and red potatoes to the frying pan with the onion mixture. Stir to spread spices evenly. Cook over medium-high heat for about 3 minutes. Add tomatoes and stir to release juices. Reduce heat to low, cover the pan, and simmer until root vegetables are tender, about 20 minutes.

Add spinach to the frying pan; cook and stir until wilted, about 2 minutes. Season with salt and garnish with cilantro.