There are two ways you make the prawn mixture. Using a board, I like to use my chopper [or you can use a large knife] to finely chop the prawns into a paste-like consistency - there's something quite therapeutic about doing it this way.
Then add the prawns to a bowl and add the ginger, garlic, soy sauce, and egg white.
Using your hands make sure the prawns are combined well with the other ingredients.
If you'd prefer a quicker way to combine the prawn mixture - then you can chuck in all the above into a food processor and blitz for around 20 seconds until it's combined.
Get your pieces of white bread, then using a spoon spread a good portion of the prawn mixture on top of the bread. Make sure to get all the mixture to the edge of the bread. Repeat with each piece of bread.
Add the sesame seeds to a plate. Then pick up a slice of bread, and with the prawn mixture side facing down, place it onto the plate of sesame seeds so the sesame seeds will stick to the prawn mixture. Repeat with the three other slices of bread.
Using a knife, carefully slice the pieces of bread into four triangles.
Preheat the air fryer for 5 minutes at 205°c.
Carefully place the triangles into the air fryer. Make sure they're well-spaced apart - so you may need to do the prawn toast in two batches.
Brush or spray oil over the top of the prawn toast, then air fry at 190°c for 8 minutes. Check it for around 5 minutes to make sure the prawn toast isn't burning. Depending on your model of air fryer, it's worth keeping an eye on it. I like mine on the crispy side, so 8 minutes is about right for me.
Serve straight away with a dipping sauce of your choice.