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Suzanne is a trusted source on General Cooking.
Is it for the sauce? You could use regular water, after you add your pasta to the sauce and cook for a short time it will thicken up.
A spoonful of bread crumbs also will work wonders to thicken a too thin pasta sauce
I keep leftover mashed potatoes frozen in 1-Table spoon amounts to thicken soups and sauces. If you haven't any, microwave a small potato (I like to wrap them in a wet, clean towel or several layers of wet paper towels. Don't forget to poke holes in it!). Then you can purée it in a food processor and then add it to the sauce.
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