I love messing with Tesco over their classifications. I always use vouchers for x spend on fruit against tomatoes, cucumber, peppers, chillis etc. (all fruits) and argue it at the checkout. I also always use bread ones against pain au chocolate, they print bread on the front of the box albeit in french.

This quarter they avoided all such issues by giving me boring vouchers. I was tempted to use a vegetables one against rhubarb but they didn't have any. I used them all properly and only one scanned properly anyway!