From what I’ve gathered: peanuts. Leave peanuts for them (the natural kind with shell) and hang around at a safe distance.

Slowly decrease the “safe distance” over the span of a few weeks until they’ve come to trust you and eat peanuts when you’re close to them.

Then they’ll associate you with food and will anticipate it and flock around you when you’re near them. Easy right? 😅

^ It’s my lifelong goal to befriend a crow