Finely chop and then sauté the jalapenos in butter. Set aside.
Bring all other ingredients - except for the whiskey and pieces of chocolate - to an almost boil.
When the mixture has reached the nappe-stage (82-84º C /180-183ºF), take off from the heat. Add the pieces of choclate and make sure they melt.
Once all the chocolate pieces have dissolved, add the whiskey and let the ice cream base cool down fully before the churning begins.
Add the sautéed jalapeno-pieces towards the end of the churning, when the ice cream has gained some solidity but before it is finished.