Chickpea Tuna Bagel

Ingredients

• 220g chickpeas
• 5 cornichon, finely chopped
• 1 tbsp capers, finely chopped
• 1 tsp dijon or wholegrain mustard
• 2 heaped tbsp (+ extra to serve) vegan mayo
• 5g nori sheets, crushed
• 1 tsp soy sauce
• 1 tsp garlic granules
• 80g tinned sweetcorn
• a squeeze lemon juice
• to taste salt and freshly ground pepper
• 1/2 red onion, very thinly sliced
• 60ml distilled or white wine vinegar
• 30ml water
• 1 tsp sugar
• to taste salt
• 2 bagels
• 1 head romaine lettuce
• 1/4 cucumber, sliced