Inch's Fish and Chip Waffle Sandwich

Ingredients

• 1 red onion, thinly sliced
• 1 cucumber, thinly sliced
• 300ml apple cider vinegar
• 200ml water
• 100g caster sugar
• 4 tbsp Inch's Apple Cider
• 1 tsp mustard seeds
• 1 tsp coriander seeds
• 1 tsp black peppercorns
• handful of dill
• 4 tbsp mayonnaise
• 3 tbsp creme fraiche
• 2 tbsp capers, finely chopped
• 1 banana shallot, finely chopped
• 10g dill, finely chopped
• 10g parsley, finely chopped
• splash of cider vinegar
• salt and pepper, to taste
• 4 cod fillets
• 100g cornflour
• 200g flour
• 1 tsp baking powder
• 1 egg
• 1 bottle of Inch's
• chunky chips
• baby gem lettuce
• bread