Take a sauce pan add water and hibiscus petals, keep it for boiling at medium flame.
Once it get boiled turn off the stove. You will see that water has become little purpulish.
Meanwhile in a small bowl soak the basil seeds in cold water.
Strain the water, add lemon juice, and after adding lemon juice the water will turn pink. Add sugar while the water is still hot so it can melt easily.
Once basil seeds bloomed add them also in hibiscus water.
Finally add mint leaves. Keep this lemonade in refrigerator for 2-3 hours.