Opera Gateau, one of my favourite layer cake. It consists of Jaconde biscuit, Chocolate Ganache and coffee butter cream. The old classic flavour combination.
I love this cake because of the texture of the layers. The individual component is not hard to make. It's all about the assembling the cake to have each layer evenly.
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Opera Gateua |
Jaconde biscuit:
Blanched almond
meal 135g
Icing sugar 135g
Eggs 270g
Plain flour 45g
Egg whites 135g
Sugar 22.5g
Melted butter 22.5g
1. Mix the almonds,
icing sugar, eggs and plain flour together on the mixer until light and fluffy.
2. Whip the egg
whites and castor sugar together until firm peak – but not over whipped.
3. Fold the 2 mixes
together until smooth, then fold in the melted butter.
4. Spread evenly
over baking tray and spread to a level consistency.
5. Bake in the oven
at 220C until firm but not coloured.
6. Remove from the
tray immediately once removed from the oven and sprinkle with sugar.
Coffee buttercream:
Water 75g
Sugar No.1 205g
Egg whites 112.5g
Sugar No.2 11g
Butter ( softened ) 230g
1. In a sauce pan,
prepare sugar no.1 and the water and bring to the boils. Brush down the sides
to remove any sugar syrup.
2. When the boiling
sugar reaches 116C begin to whip the egg whites with the second sugar in the
mixing bowl with the whisk attachment.
3. When the boiling
sugar reaches 121C slowly pour the sugar down the side of the mixing bowl. Whip until room
temp. Slowly add the butter to the mix, being careful not to curdle the
mixture.
4. Mix until the
mixture becomes light and fluffy. Store at room temp until time to use.
Chocolate ganache:
Fresh double cream 250g
Dark
chocolate couverture 250g
1. Bring the cream
to the boil and pour over the chocolate.
2. Form an emulsion,
and cover to the surface until ready to use.
3. For use, ganache
must be soft enough to spread, yet not too soft.
Coffee sugar soak:
Espresso coffee 100ml
Sugar 25g
Coffee extract 3g
1. Dissolve the
sugar in the hot coffee and then add the coffee extract.
2. Store at room
temp until time of use.
Opera Glaze:
Dark
chocolate couverture 225g
Canola oil 25g
1. Melt the
chocolate and stir in the oil. Store at room temp until ready to use. Use at
37C.
Assembling the gateau:
1. Spread a thin
layer of coating chocolate over a sheet of the jaconde biscuit. Once set, flip
this over onto a sheet of silicon paper onto a lined tray.
2. Soak the biscuit
through with the coffee soaker.
3. Apply butter cream over the sponge, making sure to build up the sides of the
cake.
4. Set the next
biscuit layer over the butter cream, and soak well with the coffee soaker.
5. Apply the ganache evenly over the second layer of the cake.
6. Place the last
layer of butter cream on top of the cake, being careful to make the top smooth and even.
7. Freeze the cake
slab.
8. Pour the cake
with the chocolate glaze, trim the sides.
Tip: Dips the knife into hot water before cutting the cake to get clean edge.