Posta Dana," also known as Khus Khus, refers to poppy seeds, a versatile ingredient used in various Indian cuisines, known for its nutty flavor and nutritional benefits. 

Here's a more detailed breakdown:

What it is: Posta Dana are the seeds of the poppy plant, small, kidney-shaped, and harvested from dried seed pods. 

Other names: They are also known as Khus Khus or Khas Khas in different parts of India. 

Uses:

Culinary: They are used as a spice, a topping for baked goods and pastries, and in various dishes like curries, sweets, and thandai. 

Nutritional: They are a good source of minerals like calcium, magnesium, phosphorus, and zinc, which are important for bone health, muscle function, and overall metabolism. 

Health Benefits:

Rich in Minerals: They are a good source of calcium, potassium, magnesium, and iron. 

Ayurvedic Uses: Khus Khus is considered a central herb in Ayurveda for treating certain health conditions. 

Other Benefits: They are also known to help with headaches, asthma, inflammation, insomnia, and improving immunity. 

Where to find them: You can find them in grocery stores and online retailers.