Use an apple slicer to quickly chop onions : r/lifehacks
STL file Onion blossom maker 🧅・3D printable model to download・Cults
Amazon.com: Onion Blossom Maker w The Original Better Breader Bowl- All-in-one Set Includes Blooming Onion Slicer & Mess Free Batter Breading Station for Home or On-the-Go- Durable, Reusable Meal Prep Accessory :