Step 1

While the pasta is boiling, melt the butter in a large saucepan with the flour. Whisk together on medium heat for a few minutes, until it just begins to change color.

Step 2

Add 1/2 the cream, whisk thoroughly and add the other half of the cream. Continue whisking until smooth and bring to a light boil. Whisk until it thickens (this will only take a minute or so), then turn the heat to low.

Step 3

Add the parmesan cheese in two parts, again whisking until everything is smooth and creamy. Turn off the heat, add the lemon juice in a slow stream, continuing to whisk. Taste for salt and pepper.

Step 4

Drain the pasta and return to it's cooking pot. Add the lemon-cheese sauce and stir gently until the pasta is coated. Add the ham and peas, stir to combine.

Step 5

Serve family style or individual dishes with an extra sprinkle of grated parmesan on top. Enjoy!