just to add: i didnt see them do this in either place but having tasted a newly opened bottle in the caf, i know they did something to it when it was almost empty. i know that adding vinegar will make it last longer but it also tastes pretty bad on fries. (i like ketchup, not vinegar)... and at the restaurant, the ketchup was almost non-eatable. it really tasted like someone poured some lightbeer in the bottle to make it last longer. or it was some really old ketchup. eitherway, i wasnt impressed.
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