Steps
1. In a bowl, mix tamarind paste, chili powder, turmeric powder, garlic powder, salt, olive oil, and lime juice to create the marinade.
2. Coat the fish fillet with the marinade and let it sit for at least 30 minutes.
3. Preheat the grill to medium-high heat.
4. Grill the marinated fish for about 5-7 minutes on each side or until cooked through and flaky.
5. Serve the grilled fish garnished with fresh cilantro and a side of additional tamarind sauce if desired.