In a bowl, combine the olive oil, tamarind paste, minced garlic, ground cumin, ground coriander, paprika, turmeric, black pepper, salt, and lemon juice. Mix well.
Rub the marinade all over the fish, making sure to cover both sides and the inside cavity. Let it marinate in the refrigerator for at least 2 hours or overnight for best results.
Preheat your grill to medium-high heat.
If you have a grilling basket, use it to keep the fish intact while grilling. Otherwise, you can place the fish directly on the grill grates.
Grill the fish for about 5-7 minutes per side, or until the fish is cooked through and has a crispy exterior. The flesh should be opaque and easily flake with a fork.
Garnish with fresh parsley if desired and serve with lemon wedges on the side.
Enjoy your meal!