Add the olive oil, red wine vinegar, lemon juice, grated garlic, oregano, optional honey, salt, and pepper to a jar. Shake until creamy and combined, then taste and adjust the salt or vinegar.
Sear the Salmon
Pat the salmon dry with paper towels and season both sides with oregano, salt, and pepper.
Heat 1 tablespoon olive oil in a skillet over medium-high heat until it shimmers. Sear the fillets 4 to 5 minutes per side, until a golden crust forms and the center is just barely opaque.
Move the salmon to a plate to rest while you finish the salad.
Toss and Assemble
In a large bowl, combine the tomatoes, cucumber, red onion, bell pepper, olives, and greens. Pour over most of the vinaigrette and toss gently.
Scatter the feta and dill on top, then set the salmon over the salad as whole fillets or flaked into big pieces.
Spoon any leftover vinaigrette over the fish and serve right away with lemon wedges.
Notes
Dry the salmon well: A dry surface gives you a crisp crust instead of a steamed fillet.
Do not overdress: Add the vinaigrette in stages so the greens stay crisp.
Taste your feta first: Some brands are very salty, so season the dressing lighter if yours is.
Bake option: Roast the seasoned salmon at 400F for 12 to 15 minutes instead of searing.
Make ahead: Store salmon, salad, and dressing separately and toss just before serving. Cooked salmon keeps 2 to 3 days.