Grate the potato and carrot into a clean tea-towel and squeeze out any water. In a large bowl add the grated potato and carrot and mix in the curry powder, spring onions, egg yolk and coriander, mix well.
Divide the rosti mixture in 4 and then shape into rosti shapes. Heat the sunflower oil in a large frying pan and cook the rosti’s until golden and crisp before turning cooking on the other side.
While the rosti is cooking place a pan of water on the stove about 8cm deep and bring to a simmer, then add a tablespoon of white wine vinegar.
Pop your grill onto high. Place the haddock onto a tray, dot with 10g of the butter and cook for about 6-7 minutes.
Crack the eggs into the simmering water and poach for 3-4 minutes.
Lastly melt the remaining 10g of butter in a saucepan and cook the spinach until wilted.
To plate up, place the rosti on your plates, top with the spinach, then the haddock and finally the poached egg.