Danny Quinney, 22, was dragged round the store in Broxburn, West Lothian, stabbed twice and had vodka spat in his face.
Attacker Rafal Swiderski, 21, kept yelling "Beer!" the High Court in Edinburgh heard today.
Swiderski now faces a possible j
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ail sentence after background reports have been prepared.
He appeared from custody today to admit assaulting Mr Quinney and robbing him of alcohol in Haldanes in East Main Street, Broxburn, on January 19.
Advocate depute Michael Stuart, prosecuting, said Polish-born Swiderski moved to the UK in March last year. He had worked as a butcher but was unemployed at the time of the robbery.
Judge Lord Bannatyne was told that a customer saw Swiderski walking in and out of the supermarket's storeroom with an open can of beer in his hand, and called shop staff.
He seemed drunk and had blood on his face, hands and clothing, said Mr Stuart.
As Mr Quinney approached Swiderski to see if he could help, Swiderski shouted "Beer!".
He held a knife towards the shop manager and again aggressively demanded beer.
Mr Stuart described how Swiderski grabbed Mr Quinney by the collar of his tee shirt and began to push him round the shop then sat him down on one of the food chillers.
Mr Quinney tried to fob him off with a bottle of vodka.
"The accused took the bottle and drank from it," said Mr Stuart. "Without warning the accused raised his right hand and then stabbed Mr Quinney in the right thigh."
Mr Quinney was dragged to another food chiller by his collar.
"The accused drank from the bottle of vodka and spat a mouthful of vodka into Mr Quinney's face," said Mr Stuart.
As the shop manager tried to wipe his face on his tee shirt, Swiderski ran his knife along the back of Mr Quinney's neck.
"The accused then began to pace across the floor in front of Mr Quinney before walking up to Mr Quinney and again stabbing him in the right thigh."
Customers and shop staff called police who came into the shop and drew their batons. Swiderski dropped his knife and was led away in handcuffs.
When searched, Swiderski was found to have self-inflicted cuts to both his arms and seemed to be having hallucinations. He needed 19 sutures and tranqilliser to calm him down.
Mr Quinney needed a total of five sutures to the wounds in his legs but will be scarred for life, the court heard.
Swiderski had stolen a bottle of wine and a can of beer during the incident.
He was remanded in custody to await sentence in July.