The "Devil's Sausage" is so hot its creators at Rendalls Quality Butchers in Raploch, Stirling, must wear gloves and goggles to make them.
And they said yesterday they won't sell the spicy snacks to young children or people with a heart condition.
The delicacy - which contains pork, sweet chili, jalapenos and the so-called "ghost pepper" Bhut Jolokia, one of the hottest peppers in the world - is said to be more than 400 times hotter than Tabasco sauce.
Butcher brothers Jason and Garry Rendall, whose previous creations include a Buckfast pie, say they have sold hundreds.
Jason, 28, said locals were competing to see who could manage a whole one. He said: "The look on people's faces is priceless. Big tough guys say 'I'll have one, no problem, I love hot food', but after biting into their roll and sausage their expression soon changes and they're reaching for a drink. They can't handle it. "Word has spread so fast we're struggling to keep up.
"Obviously I've tried them but even I wouldn't eat a full threesausage roll. I'm racing to the sink for water after a single bite.
"We warn people 'eat the devil's sausage at your own risk'."
The sausages are selling for 7 a kilo or 2.50 for a hot roll, which has become a big favourite with workmen who frequent the Drip Road shop.
One customer, Robert Hamilton, 35, after taking a bite into one of the sausages yesterday, said: "It's hotter than hot. I can hardly speak."
The Bhut Jolokia is a 6cm long orange or red pepper from the Assam region of north-east India and Bangladesh.
Guinness World Records says it is 401.5 times hotter than Tabasco sauce.