Possible Clues:

• Grocery chain based in Germany
• Supermarket chain founded by the Albrecht brothers
• No-frills grocery chain that collects a deposit for a shopping cart
• Grocery chain
• Grocery chain with a Winking Owl wine brand
• German supermarket chain
• Supermarket chain founded by Karl and Theo Albrecht
• Supermarket hidden in "annual dinner"
• Supermarket with an aisle of "Finds" affectionately dubbed the "Aisle of Shame"
• No-frills supermarket chain