Amazing Grilled fish burger with homemade tartar sauce

Majkl is starting the summer with a great and healthy recipe: fish burger. What is special about his own recipe is that he uses fish only in his burgers, no eggs added, no flour added, no breadcrumbs added, and no frying. The taste is sublime, very fluffy and very healthy.
Ingredients for 6 burgers:
300 g salmon fillet
300 g any white fish fillet
1 onion
4 twigs of your favorite freshly cut herb (Majkl uses savory)
1 tablespoon of brown sugar
1/2 teaspoon of salt
1/2 teaspoon of ground pepper
100 to 150 ml of cold water
Ingredients for Majkl Tartar Sauce:
200 g of mayonnaise
1/2 onion
1/4 lemon juice
3 pickles
1/4 teaspoon of salt
1/4 teaspoon of ground pepper
1/4 teaspoon of worcestershire sauce
For the recipe, please follow instructions in the video.
Bon appetit!