Combine beer and flour to a thick paste, add milk to loosen, add vinegar and seasoning.
Dip the cod in the batter, heat the oil to 160c - 170c. Deep fat fry it in vegetable oil for approximately 4 minutes, until the fish floats to the top.
Soak the peas in water overnight. Drain the peas and then cook with the bacon until tender in a pint of water. Drain any excess liquid and set aside. Lightly mash the peas.
Both oils on to heat (Vegetable oil 130C and goose fat 170C) Peel and cut the potato thickly. Blanch chips in vegetable oil until half cooked at 130C degrees. Finish by cooking in goose fat at 170C degrees until golden. Remove excess fat and season with salt and pepper.
Finely chop the capers, gherkin and anchovies. Add diced red onion. Grate the boiled egg and combine all ingredients with mayonnaise. Add parsley and lemon juice to finish.