The ultimate filet o fish sammie Recipe | Food Network UK

Ingredients

• 1 whole tail piece fresh halibut (3cm thick, by about 30cm long)
• 140g plain flour
• 1 egg, beaten
• 240ml milk
• 100g panko bread crumbs
• Kosher salt
• freshly ground black pepper
• 240g mayonnaise, store-bought
• 1 lemon, juiced
• 1 handful fresh parsley leaves, finely chopped
• 1 handful fresh basil leaves, finely chopped
• 1 handful chives, finely chopped
• 2 tbsp olive oil
• 1(30cm long) sourdough baguette
• 25g lightly packed hydroponic rocket (leafy variety, with stems)
• 1 beef tomato, cut in thick slices
• 1 ripe avocado, cut in thick slices
• Extra-virgin olive oil