Makhana is the popped seed of Euryale ferox, an aquatic plant often called the prickly water lily. Internationally it is also known as fox nuts or gorgon nuts. Despite the name, it is a seed, rather than a tree nut. Allergen advice must still be checked on each product.
Popped makhana has a mild taste and a light texture. It can be roasted and seasoned, or used in recipes such as curries and desserts.
The terms makhana and fox nuts are commonly used for the same ingredient. Lotus seeds can refer to a different plant, so check the product label rather than relying on the name alone.