Slice beef thinly across the grain into long strips.
Place beef in a bowl.
Add ground turmeric, red chili powder, ground fennel, ground black pepper, garam masala, red chili (pepper) flakes, garlic, ginger, cornstarch (corn flour), and lemon juice.
Toss to coat. Add a little water if needed. Season with salt.
Heat oil for deep frying.
When oil is hot, add beef in batches, and fry for about 3-4 minutes or until crispy and golden outside and tender inside.
Drain onto an absorbent tea towel.
Add green chilies and curry leaves. Fry until crisp. Drain onto absorbent towel.
Garnish beef strips with green chilies and curry leaves.