Cut garlic, shallots, red curly chili, green curly chili, and cayenne peppers into several pieces, then roughly blend them.

In a pan, heat cooking oil over medium heat, then sauté onion and the chili mixture until fragrant.

Add sliced lime leaves, bay leaves, galangal, and lemongrass, then cook until the spices are cooked.

Add beef slices into the pan, then add oyster sauce, salt, sugar, pepper, and beef stock. Cook until the beef is cooked. Sprinkle spring onion on top, then stir briefly.

Serve the firework beef slice with warm rice. Enjoy!