Preheat your oven to 220°C (430°F) and line a baking sheet with parchment paper. This helps with easy cleanup and ensures even roasting.
Trim the woody ends off the asparagus, about 1 to 2 inches from the bottom, and arrange the spears on the prepared baking sheet in a single layer.
Drizzle the asparagus generously with olive oil, then toss gently to coat each spear evenly—this promotes even roasting and crispiness.
Scatter the thinly sliced garlic over the spears, spreading it out so it cooks evenly and infuses the asparagus with fragrant aroma.
Sprinkle flaky sea salt and freshly cracked black pepper over the asparagus, adjusting to taste for seasoning.
Arrange the spears in a single layer with space between them for proper heat circulation, then pop into the oven on the middle rack.
Roast for 12 to 15 minutes, until the asparagus is tender, slightly charred at the tips, and fragrant with garlic. Shake the pan or flip the spears halfway through for even browning.
Once done, remove from the oven and squeeze fresh lemon juice over the asparagus for a bright finishing touch, if desired.
Transfer to a serving platter and serve warm or at room temperature, enjoying the smoky, tender spears with fragrant garlic and a hint of citrus.