The dry stockfish must be soaked in cold water for 2-3 days, changing the water at least once a day. After soaking, cook the cod in water until tender (about 20-30 minutes).
Let the cod cool, then remove the skin and bones. Mash the fish meat with a fork into a coarse paste.
Place the cod in a bowl and, while continuously whipping (ideally with a hand whisk or in a mixer on low speed), slowly pour in the extra virgin olive oil. Add it in small batches to create an emulsion and give the cod a creamy, fluffy consistency.
When the mixture is creamy, add the minced garlic, chopped parsley, and a little lemon juice. Season with salt and white pepper. Be careful with the salt, as the cod may still be salty.