This is an old family recipe my grandmother used to make me when I was a little boy.
This is an old family recipe my grandmother used to make me when I was a little boy.
Starch-thickened custards fail completely when cornstarch is heated without adequate liquid dispersion or stirred too passively during the thickening phase. Achieving a glossy, sliceable chocolate filling requires precise temperature control and constant agitation from the moment the saucepan hits the burner.
Heavy-bottomed stainless steel or enameled cast iron saucepans distribute heat evenly to prevent scorching, though thin aluminum pans require vigorous whisking. A standard wire balloon whisk works best during the initial mixing phase, while a silicone spatula ensures complete scraping during the final thickening stages.