Clean, rinse and chop the spinach leaves.
Heat oil in vessel or large pan. Add mustard seeds. As they splutter, add onions and sauté till translucent.
Add chopped tomatoes and saute till cooked.
Add chopped spinach, turmeric, chili powder and salt.
Add julienned ginger and stir for few minutes.
Remove from heat and serve with rice, roti or bread.