Place the meat in a wide bowl. Mix the lime juice, chilli pepper and tamarind paste. Pour the mixture over the meat, cover and marinate at room temperature for approx. 1 hr.
To grill the meat
Grill the meat over/on a very high heat for approx. 4 mins. on each side. Transfer the steak to a plate, cover with foil and leave to rest for approx. 5 mins. Salt the steak and cut into thin slices. Serve immediately.