Add potatoes 15 minutes before salmon and asparagus to ensure everything finishes simultaneously—potatoes need the head start while delicate fish cooks quickly to avoid dryness.

Pat salmon fillets completely dry with paper towels before seasoning to promote better browning and prevent steaming, which results in flakier, more flavorful fish.

Insert a thermometer into the thickest part of salmon to reach exactly 145°F (63°C) for perfectly cooked, moist fish that's never overdone—the most reliable way to judge doneness regardless of fillet thickness.

Cut baby potatoes in half so they match the thickness of asparagus spears, ensuring even cooking and preventing some vegetables from becoming mushy while others stay undercooked.

Squeeze fresh lemon juice directly onto the salmon right after removing from the oven rather than before baking, as heat degrades its bright acidity and aromatic oils—this preserves that vibrant citrus punch.