Heat the oil in a deep pan over medium heat.
Add the finely chopped onions.
Sauté until they turn translucent.
Add the ginger and garlic paste, stirring until fragrant.
Incorporate the beef steak pieces, browning them on all sides.
Toss in the tomatoes and green chilies.
Season with ground turmeric, ground cumin, red chili powder, and salt.
Let it simmer until the beef is half-cooked, about 15 minutes.
Add the spinach leaves.
Continue cooking for another 20 minutes, ensuring the beef is tender and the spinach is well-integrated.
Finish with garam masala and mix well.
Garnish with freshly chopped coriander before serving.