The discussion centers on finding a recipe for cooking sisymbrium altissimum, also known as tumble mustard or London rocket, with a focus on safety due to urban harvesting. While there are many raw recipes available, the preference is for cooked preparations to mitigate concerns about heavy metals and parasites. The importance of washing the plant is emphasized, but it is noted that washing alone may not eliminate all risks, particularly from parasites that can be present in urban environments. Additionally, a parallel issue is raised regarding the difficulty of cooking rucola, as it does not soften like spinach when cooked. The conversation highlights the need for caution when foraging in urban areas, considering potential contaminants from pets and environmental factors. Cooking is recommended as a method to ensure safety against parasites.
