Step 1

For the base, combine all ingredients with 200ml water in a bowl, cover with plastic wrap and stand in a cool, dark place for 12 hours to double in size.

Step 2

For the cake, place dates, bicarb and 1 cup (250ml) boiling water in a heatproof bowl and set aside overnight to soak.

Step 3

The next day, grease a 22cm ring pan. Place date mixture in a fine sieve set over a bowl and stand for 5 minutes to drain well. Place ultimate bun base in a stand mixer fitted with the dough hook. Add flour, egg, butter, sugar, vanilla, star anise, drained dates and 2 tsp salt flakes, and knead for 8 minutes or until combined and mixture forms a ball. Transfer to a lightly floured work surface, divide into 8 even pieces and cover with a clean damp tea towel.

Step 4

Working with 1 piece at a time, roll with the palm of your hand to form a tight ball, adding extra flour to work surface if sticking. Place in prepared pan and repeat with remaining dough, pressing dough to fit the pan.

Step 5

Cover with a clean damp tea towel and set aside in a warm place for 1 hour to rise slightly.

Step 6

Preheat the oven to 200°C.

Step 7

For the piping mixture, combine flour, sugar and 1/3 cup (80ml) water in a bowl until combined, then transfer to a piping bag fitted with a plain 5mm nozzle. Pipe a ring around circumference of bun cake, then pipe stripes at regular intervals from the inside to the outside of the pan to create crosses on buns.

Step 8

Splash a little water into oven to create steam (this helps buns expand before forming a crust), then bake for 15 minutes or until golden. Reduce oven to 180°C and bake for a further 25 minutes or until a skewer inserted into bun comes out clean.

Step 9

Cool in pan for 30 minutes, then transfer, top-side up, to a serving plate.

Step 10

Place dulce de leche and 1/4 cup (60ml) water in a saucepan over medium-high heat and cook, stirring constantly, for 3-4 minutes until it comes to the boil. Pour over cake and serve immediately.