Posh Fish Finger Sandwich & Homemade Tartare Sauce

Ingredients

• 2 fillets of cod or haddock, skinned and boned
• Sunflower or vegetable oil, for frying
• 200g plain flour
• 2 tsp sea salt
• 2 x 330ml bottles of lager
• 225g mayonnaise
• 80g pickles
• 1 tsp capers, chopped
• 2 tsp Dijon mustard
• 2 tsp chopped shallots
• 2 tbsps chopped spring onions
• 2 tsps freshly squeezed lemon juice
• Tabasco sauce, to taste
• Sea salt
• freshly ground black pepper
• Thickly cut fresh bread
• Butter, for spreading
• A handful of cos lettuce leaves, cut into strips
• French fries or sweet potato fries (optional)