
Cornflour – a little cornflour (corn starch) is used in the pattern batter. If you can get cake flour with a lower protein percentage, omit the cornflour & increase the cake flour by 13g (0.5 oz, 4.25 tsp).
Purple Food Colouring – I used & recommend Sugarflair concentrated food colouring paste . I used Grape Violet & a little black to help the pale batter become a purple shade quicker. Food colouring gel can be used but I don’t recommend liquid colouring. Wear gloves when using the colouring.
Tin Size - Swiss roll tins are 33 x 23cm (13 x 9″), & I use a cookie tray/sheet that is 35 x 23 x 1.5 cm (13¾ x 9 x ⅔ inch) or the one in the photos which is a 38 x 25 x 1.5cm (15 x 9¾ x 1"). I would not recommend going any bigger or smaller than these 3 sizes listed.
Greasing - Frylight cooking spray is often used, but Homemade Lining Paste/Cake Goop, can also be good. Cake release spray or softened butter are alternatives.
Read more on the Ribbon Test/Stage, Trail Test in the detailed process before this Recipe Card, or read my Ribbon Test In Baking lesson.
Blueberry Orange Curd - here is the new blueberry orange curd recipe. To fill this Swiss roll, I used about 1 jar, from 2 made from the following:
250g/8¾oz Blueberries,
5 Red Plums (90g/3oz pitted),
2 tbsp Water, 1 Lemon (cut into quarters),
350g/12⅓oz/1¾ cup Dark Brown Sugar (or combination of white & brown),
3 Medium Eggs (combined weight 168g/6oz, US large eggs),
141g/5oz/⅔ cup Unsalted Butter &
2 tsp Orange Extract, (or more to taste).
Recipe instructions & video - Blueberry Orange Curd
More tips for confidence with Swiss roll cakes, see beginning of the recipe blog.
Check out my Flour Free, Gluten Free Chocolate Swiss Roll recipe, Chocolate Orange Yule Log, the Vertical Chocolate Swiss Roll, or Ultimate Lemon Curd Swiss Roll Guide.
Template - 1" squares template can be used under your parchment paper, to see where to draw your dots for the pattern. Click the file below twice to open the pdf for saving.
1-inch-squares-template
*Egg size data from EggInfo.co.uk @ Egg Facts & Figures