Peel a carrot, then using a mandolin, slice as thin as possible while keeping the slices whole, cut the carrot into thin julienne strips rotate, then cut into a fine brunoise. Do this same process to a turnip, then take the dark green leaves of a leek, cut into julienne strips then cut into a brunoise. Bring a pot of water to a boil and for every gallon of water, add a cup of salt. Blanch each vegetable individually in a strainer, then once tender, remove from the water and shock in an ice bath. Lay the vegetables on a paper towel to remove all the excess moisture, then transfer to a smaller container.
Thinly slice 1 shallot and crush 2 cloves of garlic. To a pot, add 1 cup of white wine, the shallots, garlic, 3 sprigs thyme, and 6 peppercorns. Bring this to a boil, then add in the cod trim and turn down the heat so that it is just a simmer. Steam this for 5 minutes, or until the fish flakes apart. Remove the fish from the pot and discard the cooking liquid. Peel 6 oz of Yukon gold potatoes, cut into medium dice, then cover them with cold water by 2 inches and cook until tender. Place the cod trim in a bowl with cooked potatoes, breaking them up with a fork until evenly mixed. Add 6 g kosher salt, 1oz butter, 12 g olive oil, 4 g finely minced garlic, 12 g bruinoise, 2 g finely minced parsley & and mix.
Using a damp towel, wipe the counter, this will allow the plastic wrap to stick to your counter then roll out a 14-inch piece of plastic wrap. I found that placing two layers helps prevent the plastic wrap from breaking. Place the cod cake mixture down, spreading it out evenly in a log shape. Use the plastic wrap to help shape the log, then roll it up as tight as possible. Using the counter continue to tighten the log then tie off one of the ends. Continue to roll until it is 2 inches wide and tie off the other end. Place this in a cup to keep the shape and keep in the freezer for 4 hours or until completely frozen.