In a saucepan, pour in water; add salt and crabs; arrange the crabs so that all of them are soaked in the water; bring to a boil; continue boiling the crabs for 15 minutes; remove the foamy bubbles formed during boiling.
Add corn; boil for 15 minutes more while stirring occasionally.
Remove crabs; set aside.
Allow the corn to boil until it’s soft and cooked; once the corn is cooked, remove and set aside.
In another pan, drizzle an ample amount of cooking oil for sautéing.
Add butter or margarine; stir the butter until it melts completely.
Add garlic and stir; once the garlic is golden brown, add in the onion; stir and add ketchup; mix well.
Bring the sauce to a boil; add sugar and chili powder; stir well.
Add the shrimp while continuously stirring; simmer in low heat until shrimp is cooked.
Add salt and black pepper, to taste.
Continue to 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; mix well.
Toss in the corn.
Plate and sprinkle with green onions on top.
