Season the tuna with ground coriander, garlic powder, ginger powder, salt, soy sauce, stir to coat evenly and set aside to marinate for 10 minutes.
Heat vegetable oil in pan over medium, add the marinated tuna, stir-fry until golden and crisp for 5-7 minutes, take and set aside.
Drop the sprig of rosemary into the oil, add the minced garlic, diced onion, stir and let sweat for a minute.
Add the cherry tomatoes, black pepper, salt, stir and let simmer for 3 minutes then add the fried tuna, stir in and let simmer for 5 minutes.
Add the chopped scotch bonnet pepper, stir and let simmer for a minute.