Wash all fresh produce and measure according to the recipe. Peel the garlic clove and remove the stems from the sage sprigs.
Chop the walnuts, garlic clove and sage leafs. Zest the lemon and cut the zest into thin slices.
Cut the Parmesan into thin slices.
Mix all the ingredients with the yoghurt. Season generously with salt and pepper.
Wash the salmon fillet.
Place the salmon fillet on a baking paper sheet on an oven tray. Spread the yoghurt mix over the fillet. Place the tomatoes to the sides of the fillet.