Ekadashi is the eleventh lunar day (Ekadashi) of the bright fortnight (Shukla paksha) of the Hindu month of Ashadha (June – July). Thus it is also known as Ashadhi Ekadashi or Ashadhi. On this day images of Vishnu and Lakshmi are worshipped, the entire night is spent singing prayers, and devotees keep fast and take vows on this day, to be observed during the entire chaturmas, the holy four-month period of rainy season. The fast demands abstainance from all grains, beans, cereals, certain vegetables like onions and certain spices.(Source:wikipedia)
Observing a strict fast on this day is common among the older generation. However, if you do not want to follow the strict way, you can make any of the many traditional fasting recipes I had posted earlier. Here are the links to the same:
Disclaimer: Fasting rules can be different across communities. I have posted Maharashtrian recipes. However, you may follow the rules observed in your family or community. Also, fasting may not suit everyone. Kindly follow the same according to your age and health in consultation with your family physician.