1.Shred the carrots with a julienne slicer, salt for about 10 minutes, squeeze out the water and mix with wholegrain mustard, lemon juice, pepper, olive oil, honey and white balsamic.
2.Season the prawns with pepper and paprika and cook them.
3.Spread basil pesto on sourdough and add romaine, cheese, the carrot rapée and the prawns — done!