Rosti fish cakes recipe | Good Food

Ingredients

• 300g potato
• 80g can tuna in brine, drained (or use salmon - see tip, below)
• 2 tbsp caper in brine, drained
• 2 spring onions trimmed and finely chopped
• 1 large egg beaten
• 4 tbsp olive oil
• ½ bunch asparagus spears from Asparagus, pea & feta frittata - see 'goes well with')
• 1 tbsp lemon juice
• 1 tsp Dijon mustard
• ½ pack watercress