Preparation
Prep the Asparagus: Thoroughly wash the asparagus spears and pat them completely dry.
Hold each spear and bend it gently; it will naturally snap at the point where the tender part meets the tough, woody end.
Discard the woody ends.
Create the Bundles: Group 2-3 asparagus spears together. Tightly wrap one slice of prosciutto around the middle of each bundle, creating about 10-12 bundles in total.
Heat the Pan: Place a large frying pan or skillet over medium-high heat.
Add the olive oil and the optional rosemary sprig to infuse the oil with flavor as it heats.
Cook to Perfection: Once the oil is shimmering, carefully place the wrapped asparagus bundles in the pan in a single layer.
Cook for 4-6 minutes, turning the bundles regularly, until the prosciutto is crispy on all sides and the asparagus is tender-crisp.
Serve: Remove from the pan, season with a pinch of freshly ground black pepper, and serve immediately while hot.
Don't overcrowd the pan.
Cook in batches if necessary to ensure the prosciutto has enough space to crisp up properly.