The thickener in question is cornstarch. It needs to boil for a full minute to work properly. You might try heating it again, over low flame, and stirring constantly back to a boil. Please call the Baker's Hotline with questions at 1-855-371-2253. Laurie@KAF
December 21, 2014 at 9:59am
In reply to I made the filling and it was nice and thick when I strained it… by kaf-sub-0gmfallon68 (not verified)