While the stalks are perfect for jam, rhubarb leaves contain oxalic acid, a poison that can cause serious kidney problems. Never cook them; they must be composted.
Red beans: cook thoroughly to avoid the worst
A handful of raw or undercooked kidney beans can be enough to cause violent vomiting. The culprit: phytohemagglutinin. To protect yourself from it, it’s essential to boil them vigorously for at least 10 minutes.
