A Scottish dairy is offering the UK’s most expensive cup o’ joe: 272 British pounds ($344) for a flat white—a double shot of espresso topped with a layer of steamed milk and a fleeting work of foam art.

The costly cup is actually a perk for purchasing shares in Mossgiel Organic Dairy’s crowdfunding campaign to enlarge its sustainable operation and produce more milk. Investors who buy 34 shares in the farm get a certificate for a flat white that can be redeemed at one of 13 coffee shops in Scotland that use the dairy’s milk.