Roughly chop half the prawns, place in a medium sized bowl and stir through ¼ tsp sugar, ¼ tsp salt, ¼ tsp sesame oil and ¼ tsp Japanese kombu extra if using.
Place the remaining prawns, sugar, salt, sesame oil, Japanese kombu extract and egg white in a small food processor and blend until smooth.
Combine the prawn paste with the chopped prawns in the bowl. You may want to take a small scoop and cook in a frying pan to check the seasoning. Cover and rest in the fridge for 20 minutes minimum.
Place the garlic bread on a chopping board and cut between the precut slits. Once you have done this to the whole loaf, cut where the slits are and have the garlic butter side face up.
Using a butter knife, generously top each slice of garlic bread with the prawn mixture, so that the ratio of bread to prawns is about the same. Shape the mixture so that mixture comes right to the edges of the bread. Dip the prawn side into panko crumbs. (Toasts can be kept in the fridge over night at this stage if required).
Pour oil into a wok until one-third full. Heat until a small piece of bread dropped into oil sizzles. Cook toasts, in batches, prawn side down, for 3 minutes. Turn and cook for a further 1 minute or until golden. Remove to a wire rack over a baking tray. Keep warm in oven while cooking remaining prawn toasts.
To make the relish, combine all ingredients together in a small bowl.
Serve prawn toasts with relish and enjoy!