01 - Preheat a large, heavy-bottomed pot or Dutch oven over medium-high heat, then add the vegetable oil.
02 - Introduce the beef cubes into the heated pot, searing them thoroughly on all sides until well-browned. Work in small batches to avoid overcrowding, then remove the browned beef and reserve.
03 - Utilizing the same pot, add the finely chopped onions and sauté for 5 to 7 minutes until they become tender and translucent with a golden hue.
04 - Incorporate the minced garlic, grated fresh ginger, and sliced green chilies, cooking for an additional 2 minutes while stirring constantly to release their aromatic essence.
05 - Introduce the curry powder, ground cumin, ground coriander, ground turmeric, cayenne pepper, garam masala, salt, and black pepper. Stir continuously for approximately 1 minute until the spices become highly fragrant.
06 - Add the chopped tomatoes to the pot, cooking for 5 minutes and pressing them with a spoon to break them down and integrate into the spice mixture.
07 - Return the reserved browned beef to the pot, thoroughly stirring to ensure each piece is evenly coated with the rich spice and tomato mixture.
08 - Pour in the coconut milk and beef broth. Stir gently to combine all ingredients, then bring the mixture to a gentle simmer.
09 - Reduce the heat to low, cover the pot, and allow the curry to simmer for 1 hour and 15 minutes. Stir periodically to prevent sticking, continuing until the beef is exceptionally tender and the sauce has noticeably thickened.
10 - Taste and adjust the seasoning as necessary. Prior to serving, garnish generously with fresh chopped cilantro.