I have a similar unidentified curiosity- a ptch of what we currently call 'garleek'. I thought it might be welsh onion to begin with. Very leek-like growth, perennial, bulb end is like a leek or spring onion, stem leek-like a mid thickness leek and leaves upright to about 18inches. Flowering stalk to 2 feet+ topped with the usual allium onion roof that opens to very pale pinky/mauve cluster of allium flowers.
Young growth is like a mild garlic/onion taste but then goes to a very very strong garlic smell.
The allium neopolitanum description does fit with it's defined bulb