SidesMost sides finish faster than the main — start the quick ones last so everything lands hot.
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Steps
1Soak the cut chips in a big bowl of cold water for 30 minutes to pull out surface starch. Drain, then dry them thoroughly on clean kitchen towels; wet chips spit in hot oil.
2Stir the mayonnaise, pickles, capers and the juice of half the lemon together with a pinch of pepper. Chill the tartar sauce until serving.
3Pour the vegetable oil into a dutch oven so it comes no more than halfway up the sides. Heat to 300°F. Heat the oven to 200°F and set a wire rack over a baking sheet.
4Fry the chips in 2 or 3 batches for 8 to 10 minutes, until soft and just starting to color. Lift them out with a spider and lay them on a rack to rest, at least 15 minutes.
5Whisk 1 1/4 cups flour, the cornstarch, baking powder, 2 tsp salt and some pepper in a bowl. Pour in the cold beer and whisk just until smooth; a few small lumps are fine.
6Raise the oil to 375°F. Season the cod with salt, dredge in the remaining 1/2 cup flour and shake off the excess. Dip each piece in the batter, let the extra drip off, and lower it into the oil away from you.
7Fry the fish in 2 batches for 5 to 6 minutes, turning once, until deep golden and crisp. Move to a clean rack set over a baking sheet in the warm oven. Let the oil come back to 375°F between batches.
8Return the rested chips to the 375°F oil in batches for 2 to 3 minutes, until deep golden and crunchy. Drain on paper towels and salt right away.
9Serve the fish and chips together, sprinkled with malt vinegar, with lemon wedges and the tartar sauce.
10Turn off the heat and let the oil cool completely in the pot, which takes a few hours. Strain it through a fine sieve into a jar. If it looks clean you can reuse it for frying; the batter leaves flour behind, so if it is dark, cloudy or smells off, seal it in the jar and throw it away with the trash. Never pour it down the drain, where it hardens in the pipe.