Update: would believe they sell those 2,40€ each? Guess they're pretty prized.
Anyways, I first attempted to rip and eat each leaf individually, but I found it much more enjoyable to just dip the whole tip of the flower then bite it off.
Outer leaves are very fibrous, so I had to spit them out, whereas the inner ones were so soft I could just swallow them after a few bites.
I ate the head's insides just fine, while the stem was too bitter to eat.
I'd say it was worth the two and a half euros.