Brioche Dough: Pour the flour into a large bowl. Add the salt, sugar, eggs, softened butter and yeast into the centre. Mix well to form a dough. Place a plate on top of the bowl and let rise overnight (or for 6-7 hours).
On a floured surface roll the dough out and fold into four. Repeat the process once. Form a roll and cut into 8 or 10 pieces. Transfer to a buttered loaf tin. Let rise in a warm area until the top of the dough reaches the edges of the tin.
Meanwhile, preheat the oven to 150 degrees C.
Bake the brioche in preheated oven for 20-25 minutes. Remove from the oven and immediately brush with sugar glaze.
Glaze: Make the glaze by combining water with icing sugar until smooth. Set aside.