First dip the cedar planks into water for 2 hours.
Preheat the oven to 200˚C.
In a bowl, combine the maple syrup with lemon zest and juice.
Lay the cedar planks on a roasting tray.
Place the salmon skin-side down in a single layer on top of the cedar planks. Add the smoked salmon slices to cover and brush with the maple mixture. Season well.
Place in the oven and roast for 12 - 15 minutes or until cooked through and uniformly pink in the centre.
In the meantime, prepare the mashed potato, and courgettes. Sautee the courgette in a little of butter and salt and pepper. Let them soften for 5 minutes until just lightly coloured and cooked through. Add lemon juice last minute.
To make the sauce, in a third pan, bring to simmer the white wine, maple syrup for 2 minutes, add the cream and bring it back to the boil. Check the seasoning. Remove from the heat and swirl in the butter until combined.
Remove the salmon from the oven and serve immediately with the creamy mash, courgette and the drizzle of the sauce.