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I always thicken my home made gravy with cornstarch mixed with water.  Put some cornstarch in a measuring cup(maybe 1/2 cup depending how much gravy you are making).  Add some cold water and mix.  It has to be a little on the .  If its too watery, add more cornstarch.  You don't want it too thick and paste like either.  Heat your gavy fixings until they start to boil.  Then add the cornstarch mixture a little at a time while stirring your gravy.  Don't over due it, you might not need all the cornstarch/water mixture.  Pour and stir for about 15 seconds, if its not thick enough add more cornstarch/water.  I don't know the exact cornstarch to water ratio cuz I just eyeball it and like I said it depends on how  much gravy you are making.  I would start with say 1/2 - 3/4 cup of cornstarch and 1/4 cup of water.  If its too thin then add more starch.  You have to mix the cornstarch and water using COLD(from the tap) water.  It will not dissolve in warm/hot water.  Stir the cornstarch/water until its fully mixed.
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