| Pasta, portion, cooking | 340g (12oz) penne, or homemade gnocchi, serves 3-4 | Short pasta (penne rigate recommended), 200g, serves 2 | 320g pennette rigate, serves 4 |
| Salt in the pasta water | Water salted 'generously' (no % given) | 1 tbsp rock salt in 5L water | Well-salted boiling water (no % given) |
| The four cheeses | 40g Gorgonzola, 50g taleggio, 50g Emmental, 40g Parmigiano-Reggiano | 50g Gorgonzola, 50g stracchino, 50g mascarpone, 3-4 tbsp Pecorino Romano | 80g taleggio, 80g Parmigiano-Reggiano DOP, 100g Gorgonzola (dolce), 80g Gruyère |
| Base fat/dairy | 15g (1 tbsp) unsalted butter + 120ml milk (add more to taste) | 80ml milk (no cream used) | Milk only (no butter or cream) |
| Heat for melting and finishing | Low heat throughout: 3 cheeses then Parmigiano (no instruction to turn off heat) | Melted over medium-low heat; only the pecorino goes in after the heat is off | Milk warmed over low heat to near-boiling, cheeses melted in order, with the Parmigiano added only after the heat is off |
| Adjusting consistency | Adjusted to taste by adding milk gradually | Reserves a mugful of pasta water and adds a third of it along with the mascarpone | Adjusted with milk quantity and heat control only (no pasta water) |
| Doneness | Per package instructions, or to preferred al dente (no early-pull instruction) | Per package instructions (no early-pull instruction) | Pulled 1 minute before the package time, finished in the sauce |
| Finish | Extra Parmigiano-Reggiano grated on top | Scattered with crushed walnuts | Seasoned with white pepper, finished with a grind of black pepper |
| Time | 20 minutes cooking (serves 3-4) | 5 minutes prep + 15 minutes cooking = 20 minutes total (serves 2) | 10 minutes prep + 15 minutes cooking = 25 minutes total |
| Source check | Source verified | Source verified | Source verified |