This is probably a fairer comparison. Sainsbury's are 85p a kilo for normal brown onions, Coop.ch are £1.82 per kilo. Both prices for a 1kg bag.
https://www.coopathome.ch/de/supermarkt/fr%C3%BCchte-gem%C3%BCse/kr%C3%A4uter-gew%C3%BCrze/zwiebeln-knoblauch/zwiebel-gelb/p/3090393
https://www.sainsburys.co.uk/gol-ui/product/sainsburys-onions-1kg
Edit: Cheapest possible onions at Sainsburys are 55p per kilo and £1.09 at Coop.
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This is probably a fairer comparison. Sainsbury's are 85p a kilo for normal brown onions, Coop.ch are £1.82 per kilo. Both prices for a 1kg bag.
https://www.coopathome.ch/de/supermarkt/fr%C3%BCchte-gem%C3%BCse/kr%C3%A4uter-gew%C3%BCrze/zwiebeln-knoblauch/zwiebel-gelb/p/3090393
https://www.sainsburys.co.uk/gol-ui/product/sainsburys-onions-1kg
Edit: Cheapest possible onions at Sainsburys are 55p per kilo and £1.09 at Coop.