Mix together the salt, 3 tbsp sugar and paprika
Sprinkle the mixture over the top of the salmon fillet and leave to cure for 30 minutes
Preheat the oven to 170c or 150c for a fan oven
Lift the salmon and shake off all the excess curing mixture
Place the cured salmon fillet onto a piece of baking parchment, then drizzle with the Maple Syrup
Fold up into a parcel and transfer onto a baking tray
Bake for 20-25 minutes or until fully cooked
While the salmon is cooking, slice the red onions as thinly as possible and place into a container with a lid
Pour the red wine vinegar over the onions and sprinkle with the remaining 1 tbsp sugar before closing the lid
When the salmon is cooked, remove it from the oven and serve with the pickled red onions