Clean and season shrimp: Devein shrimp (keeping shells on). Season with ginger, garlic, salt, black pepper, lime juice, and pimento. Set aside to marinate for 1 hour.
Sauté aromatics: Heat oil in a pan over medium heat. Add scotch bonnet and sauté for 2 minutes. Add bell peppers, carrots, onion, and celery. Cook for 2–3 minutes until just softened.
Build the sauce: Add ¼ cup water, ketchup (reserve some), and soy sauce. Simmer for 5 minutes.
Add shrimp: Stir in shrimp and remaining ketchup and water. Cook for 5–6 minutes, until the shrimp turns pink and is fully cooked.
Taste and finish: Adjust salt if needed. Garnish with fresh parsley or chadon beni. Serve hot with white rice.