Trim about 1 inch from the woody bottom of the asparagus bunch and rinse them well. While the asparagus is drying slightly, mince the garlic cloves and zest the lemon. This prep work takes just a few minutes and ensures everything is ready when you need it—I always do my mincing and zesting before any cooking begins so there are no delays once the Instant Pot is heating up.
Pour 1/3 cup water into the Instant Pot, then place the trivet (steamer rack) inside. Arrange the trimmed asparagus on top of the trivet in a single layer as much as possible. Drizzle the olive oil and dot the butter over the asparagus, then scatter the minced garlic and lemon zest evenly across the spears. Sprinkle with sea salt, black pepper, and red chili flakes.
Close the lid and set the valve to sealing position. Press the manual/pressure cook button and set the timer to 0 minutes—this means the asparagus will cook only from the pressurization time itself, keeping the spears tender-crisp rather than mushy. Once the cooking cycle completes, perform a quick pressure release by carefully moving the valve to venting. Wait a few moments for the pressure to fully release, then carefully remove the lid.
Using tongs or a slotted spoon, carefully transfer the asparagus to a serving plate, allowing excess liquid to drip off. Top with the fresh chopped parsley and serve immediately with lemon wedges on the side. I like to squeeze fresh lemon juice directly over the asparagus just before eating for a bright, clean finish that complements the garlic and butter beautifully.