Cajun Shrimp and Rice

INGREDIENTS

• Kosher salt and freshly ground pepper
• 2 teaspoons Cajun seasoning
• 4 plum tomatoes, chopped
• 2 tablespoons extra-virgin olive oil
• 1 pound large shrimp, peeled and deveined, tails intact
• 3 tablespoons chopped fresh parsley
• 3 cups cooked white rice
• 1 tablespoon unsalted butter
• 2 bunches scallions, chopped
• 3 cloves garlic, minced
• Lemon wedges, for serving (optional)