Toast the anise seed and cumin seed on a dry, hot large sauté pan, shaking the pan constantly, until fragrant, for about 1 minute.
Set aside.
Add vegetable oil, until rippling over high heat.
Add the scallions and garlic and cook for 1 minute, stirring often. Add the tomato, chile and cilantro, stirring well to incorporate, cook for 3 minutes.
Add the anise seed, cumin and oregano and cook for 2 minutes longer.
Add the shrimp and cook for approximately 1 1/2 minutes on each side or until pink.
Adjust seasoning. Serve immediately with lime wedges.