In a small bowl or jug, combine half of the water with the sugar and yeast. Set aside for 4-5 minutes to proof. The mixture should develop a thick, frothy layer on top.
This is a great proof that the yeast is active.
Forming the Dough
Sift the flours into the bowl of an electric mixer. Add the salt and stir well to combine.
Make a well in the centre of the flour mixture. Pour in the yeast mixture, add the eggs, and stir together with a wooden spoon.
Gradually add the remaining water, a little at a time, until the dough just comes together, with a little flour still remaining at the bottom of the bowl.
Add the softened butter and knead, using the dough hook, until the butter is fully incorporated into the dough.
Knead The Dough
Set the mixer on low and knead for further 5-7 minutes, until the dough is smooth, elastic and shiny.
First Proof
Lightly oil the dough, cover the bowl with a clean cloth, and leave it to proof for 1-1½ hours at room temperature, until doubled in size.
Add the Lemon Spice
Once the dough has doubled in size, gently punch it down to release the air and transfer it to a lightly floured surface.
Using your fingers, gently stretch the dough out, then brush the chilled melted butter all over the surface and sprinkle with the lemon zest.
Fold the dough over itself, lightly dust with flour, and knead until smooth and soft once again.
Set the dough aside to rest for another 5 minutes.
Shape the Buns
Divide the dough into equal-sized portions and shape each one into a ball, tucking the edges underneath to create a smooth surface.
Arrange the buns on a baking tray lined with baking paper. Cover with a clean cloth and leave to proof for a further 45 minutes.
Bake the Buns
Preheat the oven to 200°C / 180°C fan / 400°F / Gas Mark 6.
Beat the remaining egg with 1 tbsp cold water. Brush the tops of the buns with the egg wash, then sprinkle with the crushed almonds.
Bake in the preheated oven for 18-20 minutes, or until the buns are beautifully golden on top.