01 - Combine beef with yogurt, lemon juice, ginger-garlic paste, salt, turmeric, coriander, and chili powder in a large bowl. Toss thoroughly to coat. Cover and refrigerate for at least 30 minutes, preferably overnight for optimal flavor penetration.
02 - Layer onions, tomatoes, potatoes, and green chilies evenly across the bottom of the slow cooker insert.
03 - Arrange marinated beef over the vegetable layer, scraping any excess marinade from the bowl.
04 - Sprinkle curry powder or garam masala, cumin, paprika, bay leaves, cinnamon stick, cloves, and cardamom pods evenly over the beef.
05 - Pour beef broth and coconut milk into the slow cooker. Stir gently to incorporate spices without disturbing the layered ingredients.
06 - Cover and cook on LOW setting for 8 hours or HIGH for 4 hours until beef is fork-tender and sauce has thickened to desired consistency.
07 - Discard bay leaves, cinnamon stick, cloves, and cardamom pods before serving.
08 - Sample the curry and adjust seasoning with additional salt and pepper if needed.
09 - Sprinkle fresh cilantro over the curry and serve hot accompanied by steamed basmati rice or warm naan bread.