Step 1

Put the flour, salt and sugar in a mixing bowl. Measure 300ml cold water into a jug, add the yeast and stir. Make a well in the flour and pour in the liquid. Mix, then knead on your work surface for 10 mins. Shape into a ball, put in a lightly oiled bowl, cover and chill for at least 2 hrs.

Step 2

Put the butter between 2 sheets of baking parchment. Using a rolling pin, bash and roll it into a rectangle about 20 x 15cm. Leave wrapped in the baking parchment and chill.

Step 3

Transfer the chilled dough to a floured surface and roll into a 40 x 20cm rectangle. Place the unwrapped slab of butter in the centre of the dough, so that it covers the middle third.

Step 4

Fold one side of the dough up and halfway over the butter.

Step 5

Fold the other side of the dough up and over the butter in the same way, so that the two edges of the dough meet in the centre of the butter.

Step 6

Fold the dough in half so that the point where the ends of the dough meet becomes the seam. Wrap in cling film and chill for 30 mins.

Step 7

Repeat the rolling, folding and chilling process (steps 3-twice more in exactly the same way – rolling the pastry while it’s still folded – without adding more butter. Wrap and chill overnight.

Step 8

The next day, roll the dough out on a floured surface into a large rectangle, measuring about 60 x 30cm. Using a sharp knife or pizza cutter, trim the edges to neaten.

Step 9

Cut the dough in half lengthways so that you have 2 long strips, then cut each strip into 6 or 7 triangles with 2 equal sides.

Step 10

Take each triangle in turn and pull the two corners at the base to stretch and widen it.

Step 11

Starting at the base of each triangle, begin to gently roll into a croissant, being careful not to crush the dough.

Step 12

Continue rolling, making sure the tip of each triangle ends up tucked under the croissant to hold in place. If adding any fillings (see tips, below), place across the widest part of the triangle before rolling up.

Step 13

Bend the ends of the croissants inwards, then transfer to baking trays lined with baking parchment, spaced well apart. Cover with lightly oiled cling film and leave to rise for 2 hrs, or until doubled in size.

Step 14

Heat oven to 200C/180C fan/gas Mix the beaten egg with a pinch of salt and use to generously glaze the croissants. Bake for 15-18 mins until risen and golden brown, then cool on wire racks.