Is undercooked asparagus poisonous?

Generally speaking, asparagus is not toxic even when not fully cooked. The detailed explanation is as follows:

Asparagus is an edible vegetable that does not naturally contain toxic substances. Even if it's not completely cooked, it generally will not produce toxins. The main components of asparagus are water, protein, dietary fiber, vitamins, and minerals. When uncooked, the texture might be somewhat tough and slightly bitter, and the efficiency of nutrient absorption may be slightly affected, but there is no safety risk of poisoning after consumption. However, undercooked asparagus might retain pesticide residues or bacteria if not thoroughly washed, which could potentially cause gastrointestinal discomfort if improperly handled. This, however, is unrelated to the inherent toxicity of the asparagus itself.

Although asparagus is non-toxic when undercooked, it should still be thoroughly washed before cooking to remove any surface impurities and pesticide residues. It is recommended to control the cooking time and temperature according to the recipe—for example, when stir-frying or making cold dishes, briefly blanching the asparagus in boiling water can help remove some oxalic acid and improve tenderness and flavor. If using it for soups or stews, extend the cooking time appropriately to ensure the asparagus is fully cooked and achieves the desired texture.