Thinning the sauce: Keep some of the pasta cooking liquid just in case you need it to thin out the sauce.
Don't let the parmesan cheese curdle: Turn the heat down or take the pan off the heat before adding the parmesan cheese, as it can curdle if exposed to the heat and this will cause your sauce to become lumpy.
Undercook the tortellini pasta: If you overcook it, it might fall apart when combined with the sauce, so slightly undercook them and they'll continue to cook in the sauce.
Keep an eye on the sauce: Watch the sauce. You don't want it to dry out, so feel free to add a little pasta cooking water or cream if needed.
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