Chocolate-orange layer/collar cake, Showstopper

Rahul Mandal’s Chocolate, Orange & Ginger Surprise Cake

The handshake card

• Baker: Rahul Mandal
• UK series: Series 9 (2018)
• Week: Week 2, Cake Week
• Challenge: Showstopper
• Handshake fact: Rahul received the first-ever Hollywood handshake for a Showstopper in the documented Bake Off record; Ruby Bhogal received the second in the same challenge.
• Yield: 12 servings
• Difficulty: Needs skill
• Official recipe timing: 1 hour hands-on; 30–35 minutes baking, plus chilling and decorating
• Source: Rahul’s Chocolate, Orange & Ginger Surprise Cake, The Great British Bake Off

A necessary bit of honesty about the published recipe

In the tent, Rahul’s handshake was for a chocolate-orange layer/collar cake made for the Series 9 Week 2 Showstopper: a multi-tiered cake with a chocolate collar. The official GBBO page linked to that bake is a related published recipe titled Chocolate, Orange & Ginger Surprise Cake. It is not presented as a frame-for-frame transcription of the on-show cake. It adds stem ginger, a hidden center of shell-coated chocolate sweets, and a cacti-and-rock-garden decoration; it does not reproduce every visual detail of Rahul’s judged Showstopper.

That distinction matters. This entry gives you the publicly published Rahul recipe as an official related adaptation, while the lore identifies the actual handshake bake accurately.

Why it earned the handshake

Series 9’s Cake Week Showstopper asked the bakers for a multi-tiered cake wrapped in a chocolate collar, with flavor and visual impact doing equal work. The tent was hot, which is an especially unkind environment for tall cake and chocolate. Reporting from the episode records Prue Leith’s admiration for Rahul’s construction and Paul’s praise for how impressively it held together. Paul then called Rahul over and acknowledged that he had never given a handshake during a Showstopper before.

Rahul’s reaction was characteristically practical and wonderfully human: he wondered whether Paul had found a cocktail stick accidentally left inside the cake. The published adaptation keeps the same spirit of engineering and surprise. Its chocolate-orange-ginger sponges are sturdy, the center is concealed until the cake is cut, and the cactus garden turns structural problem-solving into a party reveal. The handshake belongs to the original collar cake; this recipe is its official published cousin.

Ingredients

Sponge

• 120ml (½ cup) whole milk
• 85g (¾ cup) unsweetened cocoa powder
• 500g (about 2½ cups packed) dark muscovado sugar
• 170g (¾ cup) baking spread
• 5 large eggs
• 9 balls stem ginger in syrup, drained and finely chopped
• 300g (2½ cups) self-rising flour
• ½ tsp baking powder
• 3 tsp ground ginger
• Finely grated zest of 2 large unwaxed oranges

Orange American buttercream and decoration

• 250g (about 1 cup plus 1 tbsp) unsalted butter, softened
• 2 tsp orange extract
• 500g (about 4 cups) sifted confectioners’ sugar
• Pinch of salt
• Red, green, and dark-green food-coloring pastes

Chocolate buttercream and filling

• 400g (14 oz) 60% dark chocolate chips
• 150g (⅔ cup) salted butter
• 200g (scant 1 cup) unsalted butter
• 350g (about 3 cups) sifted confectioners’ sugar
• 400g (14 oz) mini shell-coated chocolate sweets

You will also need two round cake pans, a round cutter smaller than the cakes, piping bags and tips, parchment, and dried spaghetti strands for the cactus stems.

Method

1. Heat the oven to 350°F (180°C; 160°C fan). Grease and line the cake pans.
2. Warm the milk until just below boiling. Take it off the heat, whisk in the cocoa to make a thick paste, and transfer the paste to a mixer bowl. Beat in the muscovado sugar, baking spread, and eggs for 3–4 minutes, until fluffy.
3. Toss the chopped stem ginger with 1 tbsp of the flour. Add the baking powder, remaining flour, ground ginger, and orange zest to the mixer bowl and beat just until combined. Fold in the floured ginger.
4. Divide the batter between the pans. Bake for 30–35 minutes, until risen and a skewer comes out clean. Cool in the pans for 5–10 minutes, then turn out and cool completely.
5. Make the orange buttercream by beating the butter until light. Add the orange extract and confectioners’ sugar gradually, then the salt. Beat until smooth. Set aside.
6. For the chocolate buttercream, melt the chocolate gently over simmering water and cool it for about 10 minutes. Beat the salted and unsalted butters together, add the confectioners’ sugar, then beat in the cooled chocolate until no streaks remain.
7. Cut a circle from the center of two sponges, leaving two even rings. Keep the cut-out cake. Reserve 5 tbsp of the chocolate buttercream. Divide the remaining chocolate buttercream into roughly two-thirds and one-third portions.
8. Set one sponge ring on a cake board with some of the larger buttercream portion. Spread buttercream across its top, add the second ring, and fill the center with the shell-coated sweets. Cover the top of the second ring with buttercream and place the remaining whole sponge on top.
9. Use the larger portion of chocolate buttercream to cover the cake in a neat first coat. Chill for 15 minutes. Mash the reserved cake pieces with the reserved 5 tbsp buttercream, roll the mixture into about 20 irregular balls, and chill them for 30 minutes.
10. Apply the remaining one-third portion of chocolate buttercream as a second coat and chill for another 15 minutes.
11. Divide the orange buttercream into four bowls: leave one white and tint the others red, green, and dark green. Load small piping bags with the combinations described in the source recipe, and put the remaining greens and a little white into a larger bag.
12. Pipe cacti and small plants around the cake. Arrange the chilled cake balls on top as rocks. Push dried spaghetti into the top at different heights, then pipe the green buttercream around each strand to form upright cacti. Finish with red buttercream flowers. Serve at room temperature so the center can tumble out when the cake is cut.

Baker’s tips

• Coat the chopped stem ginger in flour before folding it in; it helps distribute the pieces instead of letting them sink.
• Let the melted chocolate cool before it meets the buttercream. Warm chocolate can loosen the mixture and make the finish greasy.
• Chill between coats. A tall cake rewards patience more than force.
• The sweets are the surprise, so choose a candy that is dry and shell-coated. Moist or soft filling can compromise the center.
• For a family table, tell guests the cake is a surprise without describing the center. The reveal is part of the recipe’s pleasure.

Make-ahead

Bake the sponges up to two days ahead, cool, wrap, and refrigerate or freeze. Make the chocolate and orange buttercreams one day ahead; bring them to spreadable temperature and beat briefly before using. The assembled cake can be chilled overnight, but bring it to room temperature before serving. Add the candy center and final cactus decoration as close to serving as practical so the sweets stay crisp.