Allium giganteum

Allium giganteum, or giant onion, is an Asian species of onion, native to central and southwestern Asia but cultivated in many countries as a flowering garden plant. It is the tallest species of Allium in common cultivation, growing to 1.5 metres (4.9 ft).

Mine came from that famous purveyor of Asian foods, Waitrose, and I shot them in my kitchen in front of a simple roll of wrapping paper.