Chocolate Ganache Frosting for Fudgy Devil's Food Cake

Combine chocolate and corn syrup in a large heatproof bowl. Bring cream just to a simmer over medium-high heat; pour over chocolate mixture. Let stand, without stirring, until chocolate begins to melt.

Beginning near the center and working outward, whisk melted chocolate into cream until mixture is combined and smooth. Continue to whisk until frosting just barely begins to hold its shape and is slightly lighter in color. Use immediately (frosting will continue to thicken after whisking).