Sachertorte (Chocolate Cake with Apricot Jam and Poured Glaze)

Variations

• The Sachertorte dispute (Sachertortenstreit): where the jam goes was litigated for seven years, 1954-1963, between the Hotel Sacher and Demel. Sacher splits the sponge and puts jam in the middle as well; Demel puts one layer under the glaze only. This recipe follows the first. Either way the coat of jam over the outside is not optional — without it the glaze soaks into the sponge.
• Orange marmalade instead of apricot: done in Austria too, and its sharper acidity makes the chocolate read more clearly. Raspberry is too aromatic and buries the chocolate.
• Ganache instead of the glaze: made with cream and chocolate it is far easier and hard to get wrong, but you get velvet matte rather than glass. The whole look of a Sachertorte comes from the sugar-syrup glaze — swap it and you have made a different cake.
• Whole eggs, no meringue: a simpler batter, but less volume and a tighter crumb. This cake is deliberately close-textured and on the dry side, but that texture is the one folded meringue gives you.
• As individual cakes: the same batter in a muffin tin, 20-22 minutes, then glazed. Put the jam layer on top only, thinly.
• Chocolate desserts in the same family: chocolate mousse stands the same chocolate up on air alone with no baking, brownies cut the flour to a minimum and choose fudginess, and tiramisu is a layer cake that is never baked. For Austrian cooking there is already schnitzel.

Tips

• The glaze is the whole cake. The sponge is an ordinary chocolate butter sponge and the apricot jam comes out of a jar. The reason this cake has a reputation is the sugar-syrup glaze, and a thermometer solves most of it.
• 112°C is not negotiable. Lower and the glaze is thin, runs off, and sets patchy; higher and it thickens so fast it seizes mid-pour and keeps the marks. The temperature of the syrup is the final consistency (what sugar does).
• Pour once, then never touch it. This is the condition for the shine. A flowing glaze levels itself; anywhere a spatula or palette knife lands, the crystal structure is disturbed and sets matte, permanently. Put the cake on a rack over a tray and let the excess run off.
• The jam coat is waterproofing, not decoration. Without a thin set layer over the outside, hot glaze soaks into the sponge and never gleams. Sieving the jam is the same idea — lumps of fruit make a bumpy surface.
• Whites only to the tipping-peak stage. Fully stiff meringue will not fold in; it stays as lumps and shows as white streaks after baking (cooking eggs).
• Flour alternated with the meringue, mixed as little as possible. A chocolate batter is heavy, which tempts you into mixing more, and that is exactly what develops gluten (dough and gluten, choosing flour).
• Measure your oven rather than trusting it. Over 50-60 minutes on a single 22cm cake, being 20°C out is the difference between a dry cake and one sunk in the middle (what your oven is doing).
• Spend the full two hours cooling it. This is where people rush. Jam on a warm sponge soaks in and the layer vanishes, and glaze poured over that takes the rest down with it.
• Do not refrigerate it. Condensation forms on the set glaze and clouds it white. A Sachertorte keeps for days at room temperature — a day old it is arguably better, the flavour having pulled together (serving temperature).
• The unsweetened cream is not optional. The cake is deliberately close and sweet. Serving Schlagobers with it in Vienna is balance, not generosity, and sweetened cream cannot do that job (balancing flavour, dairy and heat).
• Warm the knife to cut. Set glaze cracks under a cold blade. Dip in hot water, wipe dry, cut in one stroke down, and re-warm between slices.
• Freeze before glazing, not after. Wrap and freeze the bare sponge, then do the jam and glaze after thawing. Frozen glazed, it beads with water as it thaws and loses the shine (freezing and thawing).