Gravlax sauce - recipe from my Norwegian grandmother

For the record, this recipe comes directly from Norwegian øscar's grandmother. As a great cook, she has a habit of cooking up Norwegian meals that we love so much. And you know us, big unconditional fans of sauces, we obviously fell in love with its gravlax sauce. And as with every discovery, we have one idea in mind, to share it with you !! So we added our little By Øscar touch, and here it is, all ready to enhance your Christmas tables ... For who ? Those curious to discover delicious products of foreign origin, lovers of Nordic cuisine, great gourmets who already know that they will not be able to do without ... Our gravlax sauce will make everyone agree! Gourmet reflex! A great classic to accompany a gravlax salmon, but also so good in a sandwich, to season a potato salad, to add a twist to a vinaigrette or even with white meat. Secret touch ... We are replacing the sweet mustard initially used for this recipe with a slightly more spicy mustard, in order to give more pep and character to our sauce! You will tell us the news ...