It's quite easy to answer what Nordic cooking is because the roots are our nature and what it brings us.
We cook what we can hunt, pick in the forests, catch in the seas or harvest in our fields.
Our climate gives us less harvest than in other places but it makes what ever grows here taste more and very intense. The berries and mushrooms are the best inte world! Even fish and shellfish is of the highest quality possible because of the cold water. We have a lot of game, moose, rain deer, deer and wild birds that are popular for hunters. We grow lots of root vegetables which likes our climate and gives us vegetables all around the year.
The nordic food is very much about our four seasons, Winter, spring, summer and fall. We try to live in harmony with nature and use what ever ingredients and food is in season.
We don't season our food particularly much more than with salt and pepper. But there is some spices that are commonly used. That's is such as dill, allspice, horseradish, cumin, white vinegar , sugar
We do pickle, dry, smoke, preserve and ferment as traditional ways to preserve food. But it's also a way to get unique taste to our delicious ingredients.
Most famous might be the pickled herring that is commonly served in all the Nordic countries but with each countries own touch. Dried meat is common in the northern parts meanwhile smoked meat and fish is all over the Nordics. Then there is variations of fermented fish but they aren't appreciated by everybody.
The Nordic cooking can be explained as clean, simple and sustainable.