In a saucepan pour in water, add salt and crabs. Bring to a boil. Continue boiling the crabs for 5 minutes, add corn and boil for 15 minutes more while stirring occasionally.Remove crab and Set aside. Let the corn boil until it’s soft and cooked. Once the corn is cooked, remove it and set aside.In another pan, drizzle an ample amount of cooking. Add butter/margarine. Stir the butter until it melts completely.Add garlic and stir. Once the garlic is golden brown, add in the onion. Stir, Add ketchup and mix well. Bring the sauce into a boil. Add brown sugar and spices, stir. Add the shrimp while continuously stirring. Simmer in low heat until shrimp is cooked. Add salt and black pepper to taste. Let it simmer for another minute.In a bowl, place half of the crabs and pour in half of the shrimp and sauce. Mix well so that the crabs are covered in sauce. Add the remaining crabs, shrimp and sauce and mix well. Toss in the corn.Plate and top with chopped spring onion and sliced Jalapeno