Preheat the oven to 180°
Place the salmon filets into a buttered baking tin and roast for 20-25 minutes.
Meanwhile, whisk together the mayonnaise and the wasabi to prepare your sauce.
Then slice the cucumber and the onion.
Peel the avocado and slice it lengthwise.
Once the salmon filets are done, assemble the burgers with buns, salmon, wasabi mayonnaise, avocado, cucumber and red onion slices.
Enjoy!!!