How to make a mustard sauce for salmon steak?
Gravlaxsås is a mustard sauce for salmon, made with dill.

The one I bought reports the following ingredients:


mustard
vegetable oil
sugar
water
wine vinegar
dill
modified cornstarch


On this site, the ingredients reported for gravlaxsås are the following:


6.5 tbsp. oil
2 tbsp. vinegar
2 tbsp. prepared mustard
1 egg yolk
0.25 tsp. salt
0.25 tsp. dill


Preparing the sauce seems quite easy:


Mix all ingredients in a jar and fasten lid.
Shake vigorously until the ingredients are well mixed.


Gravlaxsås is the sauce used for gravlax, a dish prepared with raw salmon, cured in salt, sugar, and dill.