Easy tuna fish cakes

Ingredients

• 3 medium-large potatoes ((each about 250g), lightly pricked with a fork)
• 1 tbsp light mayonnaise
• 185 g can tuna steak in spring water, (drained)
• 3 spring onions, (thinly sliced)
• 2 tbsp baby capers, (drained)
• 50 g cornichons (baby gherkins) (drained and thinly sliced)
• ¼ tsp paprika (not smoked)
• 65 g dried fine breadcrumbs
• 1 egg, (beaten)
• oil, for spraying
• flaked sea salt
• ground black pepper
• lemon wedges, for squeezing