I know there’ s a lot of fancy, swirly bread round here. Knots, and rolls, and babkas. Swirly bread is one of my absolute favourite things to make, but today I’m sharing something a little more simple, but still super delicious - a Boston Bun. I did a little crowd sourced research on Instagram, and discovered that, although it is called a Boston bun, nobody from Boston has ever heard of it - I have no idea where the name came from, but I do know it’s super yum, so lets just go from there.
The Boston bun is essentially one big brioche bun, filled with raisins, and topped with icing and covered in coconut. They are a bakery staple back home - we always used to get them as a special treat from the supermarket for being good and not standing up in the trolley while Mum and Dad shopped. Turns out it’s called two different things in New Zealand which is super weird - from what I can gather, anyone from the South Island or Wellington calls it a Boston Bun, while anyone further North calls it a Sally Lunn. This is one of the few things I can think of where things have different names throughout New Zealand. It’s strange.
Anyway, this is super simple to make, and doesn’t require any fancy folding or knotting or even rolling out of the dough. It starts with a basic enriched dough, which has some raisins kneaded through it. After the first rise, it gets patted into a disc and popped into a ring from a springform pan or a cake tin, which removes the need for any fancy shaping, and makes the bun rise nicely within the confines of the pan. Once it has baked to a fluffy, golden brown bun, it gets loaded up with a vanilla icing, and covered in shredded coconut. It’s essentially just fruity bread with icing, but it’s crazy easy and perfect for morning or afternoon tea treat with a cup of tea or coffee.
A few wee tips:
- The first rise for this can be done overnight if you like - you may just have to increase the second rising time by 30-45 minutes to account for cold dough, but this is a great option if you want to serve it for morning tea or breakfast!
- If you don’t have a stand mixer this can be done by hand - bring the dough together in a bowl, then turn onto a surface and knead for 10-15 minutes until smooth, then incorporate the raisins.
- If you don’t have a ring to bake this in, you can do it in an 8” cake tin too. Just make sure you lightly butter it, and place a parchment paper circle in the bottom.
Made this recipe and love it?
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A note on salt and oven temperature
It is important to note the type of salt that is called for in a recipe. I use Diamond Crystal salt throughout my recipes - if you use a different sort of kosher salt or regular table salt you will need to adjust accordingly as some salt is 'saltier' than others. Morton's salt is twice as salty, so you will need half the quantity. Same goes for a regular table salt. I am working to get gram measurements throughout my recipes for salt but still getting there.
All oven temperatures are conventional unless otherwise stated. If you are baking on fan / convection, you will need to adjust the temperature. An oven thermometer is a great investment to ensure that your oven is the correct temperature.
Tools and equipment
For a list of my go-to tools and equipment, I have a post you can refer to here.
Why is this recipe in grams?
I post my recipes in grams as it is the most accurate way to bake. Cups are not only inaccurate but they vary in volume worldwide. There is no way for me to provide one cup measure that works for everyone. However, posting in weight fixes this issue. If you would like the recipe in cups you are welcome to convert it yourself via google, but please do not ask me to do it for you as I am not comfortable providing a recipe using a method that I have not tested. Baking with a scale is easy, accurate, and also makes cleanup super simple. Here is the scale that I use if you would like a recommendation! Here's to accurate baking! If you would like to scale this recipe or convert for another pan size, use my calculator!Print
Boston Bun (Raisin Brioche Bun with Coconut Icing)
- 180g (¾ cup) whole milk, lukewarm
- 50g (¼ cup) sugar, divided
- 2 ¼ tsp active dry yeast
- 400g all-purpose flour
- ½ tsp salt
- 1 egg, at room temperature
- 100g Butter, melted and cooled
- 1 tsp vanilla bean paste
- 175g Raisins or sultanas
- 1 egg whisked with 1 Tbsp water
Vanilla Bean Frosting with Coconut
- 180g Unsalted butter, at room temperature
- 1 tsp vanilla bean paste
- ¼ tsp salt
- 375g powdered sugar, sifted
- 2-4 Tbsp Whole milk
- Desiccated Coconut to finish (I used threaded for the photos but finer tastes better to me)
- Place the lukewarm milk, 1 Tbsp of the sugar, and the yeast in a medium sized bowl, and stir to combine. Leave for 10-15 minutes, or until foamy.
- In the bowl of a stand mixer fitted with the dough hook attachment, place the flour, salt, and remaining sugar, and mix briefly to combine.
- Add the milk mixture, egg, butter and vanilla to the dry ingredients, and mix on low for 2-3 minutes. Increase the speed of the mixer to medium, and mix for a further 10 minutes, until the dough is soft and smooth. Add the raisins and mix for a minute or so to combine. Turn the dough out onto a work surface, and finish kneading the raisins in by hand. Shape the dough into a ball, and then place into a lightly buttered bowl (I use my stand mixer bowl to save dishes), cover with plastic wrap, and place in a warm spot until doubled in size, approximately an hour.
- Turn out the dough onto a very lightly floured work surface, and knock back the dough. Grease an 8 inch ring, such as the ring from a spring form cake pan, and place onto a sheet pan lined with parchment paper.
- Pat the dough into a disc, and place inside the ring on the baking sheet. Gently pat the dough to the edges of the ring, making a flat disc. Cover with plastic wrap and rise in a warm spot for 45 minutes to an hour, until puffy. In the last 20 minutes of rising, preheat the oven to 350°f / 180°c.
- Brush the surface of the bun with egg wash. Bake for 30 to 35 minutes, or until the surface of the bun is golden brown, and an internal temperature measures 200°f / 95°c. The bun should sound hollow when you tap the bottom.
- Remove from the oven, let cool 10 minutes, then remove from the ring and place on a wire rack. Allow to cool Completely.
ICING AND ASSEMBLY
- In the bowl of a stand mixer fitted with the paddle attachment, whip the butter, vanilla bean paste and salt until pale and creamy. Sift in the powdered sugar, and mix on medium speed until well combined. If needed, add milk a tablespoon at a time, until the frosting is light and fluffy, and a spreadable consistency.
- Spread the icing on the cooled bun, then cover generously with desiccated coconut.
- Slice and serve with butter if desired. Best eaten on the day it is made, but leftovers can keep in an airtight container at room temperature.