When blanching lettuce heads, be sure to put the lettuce heads in hot water, because the blanching time will be shorter, which can reduce the loss of nutrients in the blanching process and make the lettuce heads more green.

Lettuce is rich in nutrients, especially in leaves. Every 5g of fresh lettuce leaves (Beijing area) contains 1g of protein, 2.5g of fat, 16.5g of carbohydrate, 19mg of calcium, 185mg of phosphorus, 5.5mg of iron, 1.7mg of carotene, B2.6 of vitamin B and 75mg of vitamin C, etc. However, the content in the stem is much lower. Every 5g of lettuce stem contains only 1.5g of protein, .2g of fat, 4.7g of carbohydrate, and very little carotene and vitamin C..