Bring a pot of water to a boil, enough water to cover the cod. Add the cod, and cook until the fish is tender, about 5 to 7 minutes. (if your fillet is thick it will take probably 15 to 20 minutes.)
While the cod is boiling, we'll start infusing the olive oil with some garlic. In a small pan, add 1/4 cup of olive oil with the 2 cloves of chopped garlic. Cook for 2 minutes on low heat. Remove the garlic, we will not use it.
Using a slotted spoon, transfer only the fish to a food processor (not the water!)
Add the infused olive oil, the remaining 3/4 cup olive oil and the heavy cream. Purée until the mixture is smooth, thick, and completely combined.
If you don't have a food processor, you can use a handblender.