Six Bars, Six Months, and a Question About Where Our Chocolate Comes From

The white flesh around a raw cacao bean tastes like lychee. Most people who eat chocolate daily will never know this. Maha Khan, a master's student at the University of Reading, discovered it while harvesting cocoa pods from plants that have never left Berkshire.

She fermented the beans herself. Processed them in the university's food department. Turned them into chocolate without the beans ever crossing a border. The result: six bars, the first made entirely from British-grown ingredients in nearly a century.

The Second Bar in History

Only two chocolate bars have ever been made from 100% British ingredients. The first went to a six-year-old Princess Elizabeth in 1932, a gift from Rowntree's confectionery, crafted from cocoa grown in a glasshouse at their York headquarters. The second exists now, in 2026, made by Khan to mark Reading's centenary.

Six bars. That's the entire production run. A single cocoa pod takes six months to develop, so scaling up isn't a matter of ambition but of biology.

£10.4 Billion, Zero Local Beans

The UK chocolate market is worth £10.4 billion. Every gram of cocoa in that market is imported. Every bar, every truffle, every hotel minibar chocolate depends on supply chains stretching to West Africa, Latin America, and Southeast Asia.

Those supply chains are fracturing. High temperatures have stunted cocoa plants in growing regions. Excessive rainfall has drowned crops across Africa. Prices are climbing, and the effects show up everywhere from conference catering to Sofia's small craft chocolate workshops.

Bulgaria imports all its cocoa too. The bean-to-bar producers here, sourcing single-origin cacao from Ecuador or Tanzania, watch the same price volatility. When drought in Ghana pushes cocoa futures up, it appears in the cost of a bar at Zhenski Pazar within months.

300 Varieties in a Berkshire Greenhouse

Reading's cocoa collection isn't a curiosity. The university holds more than 300 varieties at its international cocoa quarantine centre, which handles 97% of the world's international movement of cocoa plants.

This is where genetic diversity survives. When climate change makes a variety unviable in its native region, the backup exists here. When farmers need hardier plants for shifting rainfall patterns, the breeding stock comes from collections like this one.

Khan's chocolate drew from that diversity. The complexity she tasted came from beans representing over 300 heritage varieties. It's the same obsession with origin and terroir that drives specialty coffee roasters and craft chocolate makers.

Maha Khan

This British bar of chocolate highlights the precarious nature of our food supplies.

Cocoa plants are very sensitive to changes in temperature and rainfall, and climate change is already causing problems in countries that produce most of the world's cocoa.

Resilience, Not Self-Sufficiency

Six bars from a university greenhouse won't replace global cocoa trade. The point is understanding vulnerability and building redundancy.

The craft food movement already does this work. Flow Cacao in Sofia sources single-origin Latin American cacao and builds direct relationships with producers. Knowing where your beans come from isn't just about flavour; it's about resilience.

Khan hopes one bar might go to the Princess of Wales, born in Reading like the chocolate. But the real gift isn't the bar itself. It's the reminder that the chocolate most of us take for granted rests on a few growing regions and on weather that has stopped behaving.

What would it mean if more regions treated their food systems the way Reading treats its cocoa collection: as both a resource and a responsibility?