2, add salt and shake well, marinate for 2 hours, then remove the water.

3, wash the salt, drain the water and add granulated sugar.

4, put it in a well-ventilated, well-lit place in the sun for about 1 week.

Plum (scientific name: Prunus salicina Lindl), Rosaceae Plum plants, deciduous trees, its crown is widely rounded, gray-brown bark, leaf blade oblong-obovate, long elliptic, drupe spherical, ovoid or subconical.

The plum has a strong adaptability to the climate, high requirements for air and soil humidity, born on mountain slopes in thickets, valleys in sparse forests or waterside, ditch bottom, roadsides and other places. Chinese provinces and around the world are cultivated, as one of the important temperate fruit trees. Li (the original variety), deciduous tree, 9-12 m tall; crown widely rounded, bark gray-brown, undulating; old branches purple-brown or red-brown, glabrous; branchlets yellow-red, glabrous; winter buds ovoid, reddish-purple, with several imbricate arrangements of scales, usually glabrous, sparsely scaled edges with very sparse hairs. Leaf blade oblong-obovate, long elliptic, sparsely oblong-ovate, 6-8(-12) cm long, 3-5 cm wide.