Step 1

Pre-heat oven to 180 °C /160°C fan / gas mark 4 and lightly grease a 10 cup / 2.4 litre bundt tin.

Step 2

Beat the butter and sugar with the lemon zest for about 4-5 minutes on the medium setting of a food mixer. Scrape down every so often until they are light and fluffy.

Step 3

Add the eggs in one at a time and mix in until thoroughly incorporated.

Step 4

Whisk the flours together in a separate bowl along with the baking powder and salt.

Step 5

Add the flours and yoghurt alternately into the rest of the cake batter. Start with the flour, then the yoghurt. The flour should be added in three additions, the yoghurt in two and mix well, scraping down the sides every so often.

Step 6

Pour the batter into the bundt tin, smoothing the surface.

Step 7

Bake for around 60 minutes or until an inserted cocktail stick comes out of the cake clean.

Step 8

Remove the cake from the oven, leave to settle for five minutes then turn the tin upside down onto a cooling rack and remove.

Step 9

Leave the cake to cool completely on the cooling rack before pouring the caramel over.

Step 10

Peel the zest off the lemon in long strips, making sure not to get too much pith.

Step 11

Pour the double cream into a medium sized saucepan and add the lemon peel.

Step 12

Bring up to a gentle heat and then remove from the heat just before it reaches a boil.

Step 13

Pour the cream and peel into a jug and leave to infuse at room temperature for at least 30 minutes. Strain out the lemon peel once infused and weigh out 300ml of the cream to use in this recipe.

Step 14

Tip the caster sugar into a medium sized saucepan and heat on a gentle temperature as the sugar begins to melt.

Step 15

Avoid moving the sugar around too much but you can encourage an even melting by gently shaking the actual saucepan around occasionally if you need to. Keep a careful eye on the sugar and do not leave at all.

Step 16

As the sugar has melted it will turn a dark golden tan colour. Watch to make sure it doesn’t get too browned as this means it’s burning.

Step 17

As soon as the sugar has melted and has turned that dark golden tan colour then pour in the strained cream and the butter. It will rise dramatically up the saucepan so stand back at first for safety.

Step 18

Stir the cream and butter into the melted sugar and it will quickly form a thick silky caramel sauce.

Step 19

Stir for a minute or two once the caramel has formed then you can turn off the heat and add the salt.

Step 20

Pour the caramel into a jug and leave for 20 minutes for it to thicken to a pourable consistency. Stir briefly before using.