Frozen maple syrup mousse

In saucepan,whisk egg yolks until pale and thickened. Whisk in maple syrup. Cook over low heat, whisking constantly, about 12 minutes or until thick enough to coat back of wooden spoon. Immediately strain through sieve into bowl. Place bowl over larger bowl filled with ice. Whisk egg mixture until cool, about 10 minutes.
Beat cream until stiff peaks form. Fold into egg mixture until combined. Place in serving bowls. Freeze overnight.