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Beer-Battered Cod with Tartar Sauce

Beer-Battered Cod with Tartar Sauce

Crispy, golden beer-battered cod paired with a cool, briny tartar sauce built on a homemade egg emulsion (mayonnaise) formula.
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Prep Time 15 minutes
Cook Time 15 minutes
Total Time 30 minutes
Servings: 4
Ingredients Method Notes

Ingredients
  

For the tartar sauce:
  • 1 egg yolk
  • 1 cup neutral oil
  • 1 tsp Dijon mustard
  • 1 tbsp vinegar or lemon juice
  • 1 tbsp Capers chopped
  • 1 tbsp Cornichons (dill gherkins) chopped
  • 1/4 tsp Worcestershire sauce (optional)
For the beer batter:
  • 1 cup all-purpose flour plus extra for dusting the fish
  • 1 tsp baking powder
  • 1/2 tsp salt
  • 1 cup cold beer
For the fish:
  • 4 - 8 Cod fillets
  • Salt and pepper
  • 2 qts Neutral oil for frying

Method
 

Tartar Sauce (homemade mayo plus flavoring)
  1. Combine the egg yolk, Dijon mustard, and acid in a tall, narrow container.
  2. Add the oil slowly and emulsify with an immersion blender until thick and glossy.
  3. Fold in the chopped capers and cornichons gently — don't overmix, as this can release liquid and thin the sauce. Stir in the Worcestershire sauce if using.
Beer Battered Cod
  1. Pat the cod fillets dry and season with salt and pepper.
  2. Dust each fillet lightly in flour — this gives the batter something to grip.
  3. Just before frying, whisk together the batter ingredients (flour, baking powder, salt, cold beer). Don't overmix; a few lumps are fine.
  4. Dip each floured fillet into the cold batter, letting the excess drip off.
  5. Lower into hot oil, laying the fillet away from you. Don't crowd the pan.
  6. Fry until deeply golden and the fish is cooked through — the batter should puff up almost immediately as it hits the oil.
  7. Move fried fillets to a wire rack, not a flat plate, to keep the crust crisp.
  8. Serve hot with the tartar sauce alongside for dipping.

Notes

Why chunky mix-ins need a gentle fold: Capers and cornichons are brined, so they bring acid and umami together in one ingredient. But folding too aggressively releases liquid from them as you stir, which can thin out an otherwise perfect batch — fold gently, not vigorously.
Why the batter needs to be cold: Cold batter fries up lighter and crisper. It's the carbonation in the beer that makes it puff on contact with hot oil, and that effect fades the longer the batter sits at room temperature.
Why a wire rack, not a plate: Resting fried fish on a flat plate traps steam underneath and softens the crust. A wire rack lets air circulate so the coating stays crisp.
Batter substitutes: A vodka batter (using vodka in place of beer) fries up light and crisp with less gluten development, if you'd rather avoid beer. Non-alcoholic beer also works, since the carbonation is doing the real work.
Storage: The tartar sauce is best within a day or two — the capers and cornichons release a little more liquid the longer they sit. Give it a quick stir before serving if refrigerated.