Many people have this question: "Lettuce and asparagus lettuce look similar and have a similar texture, so are they the same vegetable?" In fact, although lettuce and asparagus lettuce are relatives, they are two different vegetables, and their nutritional value also differs.
In terms of appearance, asparagus lettuce has broad leaves and a stem that is ringed and thick, resembling a bamboo shoot. In contrast, lettuce has long, flat leaves and a fleshy, thin, short stem, which looks like a "miniature" version of asparagus lettuce. Botanically, both asparagus lettuce and lettuce belong to the genus Lactuca. Asparagus lettuce is a stem lettuce, while lettuce is a variety of leaf lettuce—specifically, cos lettuce. Compared to asparagus lettuce, lettuce is more closely related to the common lettuce we are familiar with.
Lettuce is crisp, tender, and fragrant, earning it the name "Phoenix Tail." It is rich in vitamins and nutrients such as calcium, iron, protein, fat, vitamin B1, and vitamin B2. The nutritional content of lettuce is slightly higher than that of common lettuce and far superior to that of asparagus lettuce. Compared to asparagus lettuce, lettuce contains 40% more protein, 1.4 times more beta-carotene, 2 times more calcium, 33% more iron, and 1.8 times more selenium.
Asparagus lettuce is believed to promote digestion by helping to clear blockages and promote the downward flow of qi. Lettuce, on the other hand, is known for its benefits to the liver and gallbladder and for nourishing the stomach. The slightly bitter lactucarium found in its stems and leaves has effects such as pain relief and sedation, lowering cholesterol, aiding in the treatment of neurasthenia, clearing dryness and moistening the lungs, and resolving phlegm and stopping coughs. Lettuce also contains active ingredients like mannitol, which have diuretic and blood circulation-promoting effects. Asparagus lettuce can be prepared in many ways, such as braising, stir-frying, or cold-dressing. Lettuce, however, is primarily eaten raw. It can be served cold with various dressings, but if stir-fried, it should not be cooked for too long.