Soak salt cod in water overnight. Boil it if you don't want excess salt. Then, set it aside.
Sauté the bacon in a large skillet over medium heat until brown and crisp; this may take 3-5 minutes.
Then transfer the bacon from the skillet to a plate.
You'll have some tasty bacon drippings in the pan; remove and save for another recipe all but 1-2 tablespoons.
Then add a tablespoon or two of vegetable oil to the pan, and add the onions, garlic, thyme, and green onions.
Sauté for about a minute, occasionally stirring to prevent it from burning.
Add the tomatoes, continue cooking for about 3 minutes, then add the black pepper, paprika, and hot pepper. Mix until the ingredients are thoroughly combined. Cook for about 5 minutes or more, adding water as needed.
Finally, toss in the saltfish, cook for a few minutes, add the ackee, and cook for another 3 minutes or more—adjust the seasoning to taste. Remove from the heat and let it cool slightly. Garnish with the bacon.