The BBC:

"You can eat a berry and then bite into a lemon," says Harvey. "It becomes not only sweeter, but it will be the best lemon you've tasted in your life."

The Miracle Berry -BBC News Report

The Independent:

*Lemons:
Citric fruits are a fruit droppers' favourite tipple because the effect is so dramatic. For me, the effect was quite simply astounding. I was able to munch my way through an entire lemon without a squint. The sour tang had been completely replaced by a smooth sugary taste, a little like a sherbert lemon or homemade lemonade.

*Vinegar:
Vinegar tasted nothing like it did before when I had nearly vomited trying to swallow a gulp down. Although it still tasted like vinegar, the acidic tones had completely disappeared and had taken on an almost treacle taste.

The miraculous fruit that turns sour food sweet in your mouth - The Independent

The Telegraph:

The berries may also have significant health benefits. It is possible they could be used as a natural sweetener in foods for diabetics or as a supplement to help people lose weight without being tempted by sugary treats.

Some fruit growers even claim the berries are popular with cancer patients who undergo chemotherapy, because they can help diminish the unpleasant aftertaste.

Miracle fruit turns sour food sweet in mouth - The Telegraph

The Daily Mail:

It sounds like something Willy Wonka might have invented at his chocolate factory - a berry that can make everything sour taste sweet.

Lemons lose their sharpness, vinegar tastes like sherry and a pint of Guinness comes to resemble chocolate milkshake.

After huge success in the U.S., the so-called 'miracle fruit' is proving a big hit at parties in Britain.

Anything they subsequently eat will taste much sweeter than before. The effects last up to two hours.

The magic berry that turns sour food sweet - The Daily Mail

The New York Times:

The miracle fruit, Synsepalum dulcificum, is native to West Africa and has been known to Westerners since the 18th century. The cause of the reaction is a protein called miraculin, which binds with the taste buds and acts as a sweetness inducer when it comes in contact with acids, according to a scientist who has studied the fruit, Linda Bartoshuk at the University of Florida’s Centre for Smell and Taste. Dr. Bartoshuk said she did not know of any dangers associated with eating miracle fruit.

A Tiny Fruit That Tricks the Tongue - The New York Time