What should I do as a side to this?

[Sunshineitis]

https://www.waitrose.com/ecom/recipe/the-best-baked-salmon

I've decided to make this fir new years eve, but I'm not sure what would go best with it?

Swedish Hasselback potatoes skandibaking.com/hasselbackspotatis-swedish-hasselback-potatoes/

Hasslebacks
Cooked cabbage and peas in stock
Dauphinoius
Or if you want to go tomato based then a layered potato tomato
Or a tomato based rice dish
https://www.bbcgoodfood.com/recipes/cauliflower-steaks-roasted-red-pepper-olive-salsa#rating are great.