Boil water in a large pot. To make sure pasta doesn't stick together, use at least 4 quarts of water for every pound of pasta. After water boils add the salt.
In a large size mixing bowl add: mascarpone cheese, parmigiano, lemon juice, lemon zest, and heavy cream. Whisk until combined and creamy. Set aside.
Cut the smoked salmon into large chunks. Set aside.
Boil pasta according to package directions.
When there is 5 minutes left in cooking the pasta -add the peas to the boiling water. Taste pasta before straining to make sure 'al dente'.
Strain pasta and peas. Mix right into the bowl with prepared mascarpone cream mixture. Stir to combine.
Add the smoked salmon and stir again.
The sauce will seem runny at first. It will take about 5-8 minutes for the hot pasta to thicken it.
If desired: Garnish with sliced lemons and fresh ground pepper