Wash potatoes, peel, cut 1 ¼-inch thick and place in a strainer. Run under running water until the water runs clear.
In a large pot add 8-10 cups of cold water, season with salt and add the potatoes. On medium heat, gently heat up the water. Cook for about 20 minutes or when a fork will pass through easily. Using a spider skimmer or slotted spoon, carefully remove the potatoes and place them on a cooling rack to dry out.
5 potatoes
Place them in the freezer for an hour to dry out.
In a deep fryer, Dutch oven, or large pot heat the oil to 250°F or 120°C.
2 quarts canola oil
Add potatoes to the oil and fry in small batches until a light crust forms and they should still look pale. Remove from oil and drain on wire rack with foil or paper towels beneath it.
Put the potatoes back on a wire rack and place them in the freezer for an hour.
When you are ready to cook the fish, place the frozen potatoes in the oil and fry the chips until dark golden at the same time as the fish.
Making the Fish
Preheat vegetable oil in a deep fryer to 350°F or 177°C.
2 quarts canola oil
In a large bowl, Mix ⅔ cup flour, rice flour, baking powder, cornstarch, and salt.
1⅔ cup all-purpose flour, ¼ cup rice flour, 1 tablespoon cornstarch, 1 teaspoon baking powder
In another bowl add the remaining flour and gently whisk the Guinness into the flour, until it doesn't have lumps and is the consistency of pancake batter. Add vodka and gently mix for no longer than 20 seconds.
11.2 ounces Guinness, 2 tablespoons vodka
Season the fish with salt. Add all-purpose flour to a plastic bag, add the fish and gently toss to coat. Shake off the excess the flour.
2 pounds cod
Cooking fish and chips
Coat fish in batter, gently place into the deep fryer and cook for 8 to 10 minutes or until golden brown.
Using a spider skimmer or slotted spoon gently remove fish from oil on to wire rack or lined plate with a paper towel.
Season with salt immediately.
Add the potatoes and cook until golden brown.
Notes
When cooking the potatoes do not let it get to a vigorous boil as it will cause the potatoes to split.