Jaffa Cake Roll

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Chocolate and orange have long been one of my favorite combinations. So are raspberry and (dark) chocolate and more recently passion fruit and ruby chocolate, but I digress. Naturally, I was drawn to the Pim's cookies during my study abroad time in France and I loved the Jaffa cakes during my visit to Dublin a while back. There's even a debate on which one is best, but I'll stay out of that one. :)

Inspired by this combination, I started playing around with ideas on how to bring it together in a home made dessert. I made some muffin sized sponge cakelets topped with orange jelly and chocolate, but though they were tasty the ratios were off and the sponge texture wasn't quite what I envisioned.

Later on, I decided to steer away from the individual dessert format and into something that could work well as a centerpiece dessert, where I could focus on the flavor and texture components without the tedious piecewise assembly. Thus, I settled on the swiss roll. 

I made a pretty simple angel food cake style sponge, which is light, moist and flexible so it holds up to rolling and works as a great flavor canvas. For the rendition pictured here, I actually gave the whole thing a fall flavor twist, I'll include the variation details in the recipe notes - the sponge got a good dose of pumpkin spice mix to set the tone.

While the sponge cooled, I worked on the next essential layer - the orange jelly. For jelly made from scratch, the ratio I used is 1 tsp of gelatin powder to 1 cup of liquid - in this case, orange juice, orange zest and rooibos tea combined for the base, in which I dissolved bloomed and melted gelatin powder. For my fall inspired version, I used a pumpkin spice rooibos packet. I lined a pan the same size as the sponge with plastic wrap and poured the jelly mix inside, then set in the fridge to set. 

Finally, it was time for the chocolate - I of course planned to melt and temper some chocolate for the signature shell on top, but I couldn't pass up the opportunity to include it inside the roll as well, after all what's a swiss roll without a creamy filling? I made a simple chocolate mousse using chocolate and cream - melted the chocolate using part of the cream (I also melted a bit of gelatin to help stabilize the mousse), then let it cool to almost room temperature. Then, I whipped the remaining heavy cream and folded the ganache gently and gradually. I let it chill in the fridge before spreading it on the sponge and jelly for final assembly.

Last but not least, a Jaffa cake is not complete with the snap of a layer of chocolate - I tempered some dark chocolate and drizzled it over the roll to create a hay effect for the fall theme. you could also just pour a thin layer all over for a shell on top. This is a pretty well explained step by step to temper chocolate, I'm still working to hone my own skills so I claim no expertise in this area.

I wish I had more progress shots to illustrate these steps, but I was a bit too eager to get to the decorating part for the fall inspired jaffa roll so I put it together quickly while running ideas through my head of how I would decorate it. I made a batch of these fantastic pumpkin spiced marshmallows, which I topped with orange and white sprinkles and cut in the shape of pumpkins and leaves.

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Jaffa Cake Roll

Sponge Ingredients

• 2 eggs, separated
• 30g sugar
• 2 tsp lemon juice
• 35g milk
• 23g oil
• 7g cornstarch
• 30g flour

Method

1. Preheat oven to 325F, line a quarter sheet pan with parchment.
2. Separate eggs into two medium bowls, set whites aside for the moment.
3. Whisk oil and milk into egg yolks until smooth.
4. Sift flour and cornstarch into yolk mixture, whisk until well combined.
5. With clean whisk or hand mixer attachments, whisk egg whites until foamy.
6. Gradually add sugar while continuing to whisk, until soft peaks are achieved.
7. Add lemon juice and keep whisking to stiff peaks.
8. Fold egg whites into egg yolk mixture in 2-3 additions, careful not to deflate the whites too much.
9. Spread batter evenly in prepared pan and bake 25-30 minutes until set and lightly golden.
10. Transfer sponge to a cooling rack with the parchment lining and lay another sheet of parchment on top to prevent drying out. Let cool completely.

Jelly Ingredients

• 1 cup orange juice
• 2 tbsp orange zest
• 2 tbsp honey
• 1/2 cup water (or an herbal tea, if you's like some floral notes)
• 1 tbsp powdered gelatin

Method

1. Mix gelatin and water/tea in a small bowl and let sit for the gelatin to bloom.
2. Gently warm up to melt gelatin - this can be done in the microwave in short 20s intervals or over a bowl of hot water.
3. Pour melted gelatin in a medium bowl along with all the remaining ingredients (orange juice, zest, honey).
4. Line a pan the same size as the sponge (quarter sheet pan for this recipe) with plastic wrap and pour enough of the jelly mixture to achieve 1/4" thick layer. Let this chill in the fridge until set.
5. When ready, use plastic sheet to transfer jelly to the top of the sponge layer.

Chocolate Mousse

I used this recipe, except I mixed in darker chocolate with the semisweet for more depth of flavor.

Assembly

- lay out cooled sponge on work surface on a piece of parchment

- place jelly sheet on top, leaving 1/2" from one short edge and trimming the other end to make it just a bit smaller than the surface of the sponge

- spread chilled mousse on top with an offset spatula to a uniform thickness of about 3/4"

- using the parchment, roll the sponge tightly starting with the edge where the jelly left 1/2" space, careful not to let the jelly slip out as you do this

- twist the ends of the parchment sheet to secure the roll seam side down, and place in the fridge to set

- before serving, drizzle or spread tempered chocolate on top and decorate as desired

- slice with a clean knife to serve (dipping in warm water and wiping off with a kitchen towel before cutting ensures a clean line)

Notes

- for a fall themed variation, I made the following changes to the recipe: added 2 tsp of pumpkin spice seasoning to the sponge  at the same time as the dry ingredients; I used pumpkin spiced rooibos tea instead of water in the jelly mix; I added a pinch of nutmeg to the chocolate mousse

- I like desserts that are more subtly sweet, so I didn't add a lot of sweetness to the orange jelly. Consider including up to 1/4cup of sugar to the jelly to taste if you prefer.