Preheat oven to 180C/160C fan-forced. Line a large baking tray with foil, then baking paper. Place salmon, skin-side down, on baking paper. Spread yoghurt over top of salmon.

Combine onion, garlic, mint, parsley, dill, tomato, pine nuts, capers, lemon juice and oil in a bowl. Press mixture evenly over yoghurt layer. Season well with salt and pepper.

Bake salmon for 25 to 30 minutes or until cooked to your liking. Serve with lemon wedges.