You can make the mango pickle without sun also. Just mix everything and pour the mixed mango-spice powders in a jar. In this case you heat the mustard oil till it start smoking and then when it become cool, you add it to the spiced mango pieces. Cover with a 1 inch layer of mustard oil. Store mango pickle in a dry place for 2-3 days. But there will be moisture in the mango pieces as they are not dried in sun.