ThinkGeek sells now miracle berry fruit tablets that mess with your taste buds. Sour foods will taste sweet all of a sudden. Apparently the miracle berries have been known since at least the 17th century.

ThinkGeek says that in their tests lemons suddenly taste like the best lemonade. ThinkGeek warns that you still should not drink pure lemon juice as if it were lemonade because it will harm your throat.

After dissolving half a tablet on your tongue your taste buds will report wrong information to your brain for about 1 hour.
Proceed on your own risk.
The Miracle Berry Fruit Tablets sell for $19.99 on ThinkGeek.