Preheat your oven to 200°C (390°F). Line a baking sheet with parchment paper to keep cleanup easy.
Trim the woody ends off the asparagus, about 1-2 cm from the bottom, and spread the spears evenly on the prepared baking sheet.
Drizzle the asparagus generously with olive oil, then toss gently with your hands or tongs to coat each spear evenly. The oil should shimmer slightly and help the spears roast beautifully.
Sprinkle sea salt flakes and freshly cracked black pepper over the spears, ensuring even coverage for balanced seasoning.
If using garlic, scatter the thin slices over the asparagus now for aromatic roasting.
Place the baking sheet in the oven and roast for 12-15 minutes. During roasting, the tips will turn golden and slightly charred, and the stalks will become tender when pierced with a fork.
Once roasted, remove the tray from the oven and immediately squeeze fresh lemon juice over the hot spears. Zest the lemon directly over for an extra burst of citrus aroma.
Gently toss the asparagus to distribute the lemon and seasonings evenly. Let rest for 2 minutes to allow flavors to meld.
Transfer the roasted asparagus to a serving platter, garnishing with additional herbs or a drizzle of olive oil if desired. Serve immediately while still warm and fragrant.