Looking across the open field this week I can see isolated spikes of pink waving amongst the grasses. On looking closely they turned out to be the flower and seed stems of sorrel plants.
The sorrel stems (left) are easily confused with the common dock (right).
In fact, the two are closely related, Sorrel is sometimes called narrow leaved dock while the common dock is more correctly called broad leaved dock.
The leaves of the sorrel are edible though. (I tried it!) They can be used as an acidic bite in salads or be cooked in a similar way to spinach.