Step 1

Place macaroni in a medium saucepan and add just enough cold water to cover. Add a pinch of salt and bring to a boil over high heat, stirring frequently with a heat-resistant flexible spatula to prevent pasta from sticking. Continue to cook, stirring frequently, until water has been almost completely absorbed and macaroni is just shy of al dente, about 6 minutes.

Step 2

Immediately add evaporated milk, stir to combine, and bring to a boil. Add cheese, stir to incorporate, then add 'nduja, continuing to stir to combine.

Step 3

Reduce heat to low and cook, stirring continuously, until cheese is melted, 'nduja is fully emulsified, and liquid has reduced to a creamy sauce, about 2 minutes longer. Taste for seasoning, adding more salt if necessary ('nduja is quite salty, so pasta shouldn't need any additional salt). Serve immediately.