Ingredients:

• 1 red onion, thinly sliced
• 100ml red wine vinegar
• 1 tbsp caster sugar
• ¼ tsp salt
• 4 cod fillet fish
• 2 paninis, halved
• 8 slices of cucumber, finely chopped
• 2½ tbsp tartar sauce
• A handful of watercress, rocket & spinach salad

Instructions:

1. Preheat the oven to 200°C
2. Blanch the thinly sliced red onion by pouring boiling hot water over it then drain it after 20 seconds
3. Mix 100ml red wine vinegar, 1 tbsp caster sugar, and ¼ tsp salt in a bowl, stirring until the sugar has dissolved
4. Add in the onion, toss, then cover and set aside to pickle
5. Put 4 cod fish fingers on a baking tray and cook it according to the packet instructions 
6. Add 2 halved paninis, cut side up, for the last 3 mins of cooking time then set it aside to cool a little
7. Meanwhile, finely chop 8 slices of cucumber and stir into 2½ tbsp of tartar sauce; season with black pepper. Divide the tartare sauce mixture between the paninis
8. Assemble the sandwich and serve