Prawn burgers - 9Kitchen

Ingredients

• 1 kg green prawns, peeled, veins and tails removed, and finely chopped
• 2 tbsp olive oil
• 8 small sourdough rolls, halved
• To serve: butter, softened
• To serve: finely shredded iceberg lettuce
• 1 egg yolk
• 1 tbsp lemon juice
• 1 tsp Dijon mustard
• 300 ml olive oil
• 1 tbsp finely chopped preserved lemon