– 3 tablespoons butter (softened ) – ▢1/2 tablespoon lemon zest – ▢1 teaspoon fresh thyme leaves – ▢2 (5 oz each) salmon fillets (skin on) – ▢1/4 teaspoon ground black pepper (to taste) – ▢1/3 teaspoon garlic salt (to taste) – ▢1 zucchini (thinly sliced ) – ▢1 red onion ( thinly sliced ) – ▢1/2 bunch asparagus (trim the steam and cut in halves) – ▢2 red peppers (sliced) – ▢1 lemon (cut into wedges for serving )