When scalding the long beans, boil the water in the pot until it boils, and then you can add the beans. Keep the fire on and boil for about 5 minutes, which is generally enough.
Brief introduction of beans
Bean is an annual vegetable of cowpea. Also known as cowpea, cowpea, cowpea. Rich in protein and carotene, it has high nutritional value and good taste. It is one of the popular vegetables widely cultivated in northern China, and its popularity ranks first among all kinds of vegetables. Beans have strong adaptability, which can be cultivated in the open field or protected field, and can also be produced all year round and listed in all seasons.
Annual twining plants, herbaceous lianas or nearly erect herbs, sometimes with twining tips and nearly hairless stems, and pinnately compound leaves with 3 leaflets; Stipules are lanceolate, about 1 cm long, and the planting place extends a short distance with a straight line; Leaflets are ovate-rhombic, 5~ 15 cm long and 4~6 cm wide, with acute apex, entire or nearly entire margin, sometimes lavender and glabrous.
Racemes are axillary, with long stalks, 2~6 flowers clustered at the top of inflorescence, and fleshy dense glands are often found between pedicels; Calyx light green, bell-shaped, 6~ 10 mm long, teeth lanceolate; Corolla yellow-white, slightly blue-purple, about 2 cm long, each petal has a stalk, the flag petal is oblate, about 2 cm wide, the top is slightly concave, there are a few spikes at the base, the wing petal is slightly triangular, the keel petal is slightly curved, and the ovary is linear and hairy.