Cook the pasta slightly under al dente because it will continue cooking when tossed with the hot sauce.
- Let the mushrooms sit in the hot skillet between stirs so they have time to brown properly rather than steam.
- Freshly grated Parmesan melts more smoothly into the sauce.
- Tuna packed in olive oil is recommended; drain it well before adding.
- The heavy cream can be omitted for a lighter lemon-Parmesan pasta, using additional pasta water as needed.