Lightly grease a baking sheet. Mix the polenta and 250ml of the water together in a pan and slowly bring to the boil, stirring continuously with a large wooden spoon. Reduce the heat and simmer for 2-3 minutes, stirring occasionally. Set aside to cool for 10 minutes, or until just warm.
In a small bowl, mix the yeast with the remaining water and honey until creamy/frothy (depending on the yeast being fresh/dry). Sift 115g of the flour into a larger bowl. Gradually beat in the yeast mixture, then gradually stir in the polenta mixture to combine. Turn out on to a lightly floured surface and knead for 5 minutes until smooth and elastic.
Cover the bowl with lightly oiled cling film and leave the dough to rise in a warm place for about an hour or until it has doubled in bulk.
Melt the butter in a small pan add the pine nuts and cook over a medium heat, stirring, until the pale and golden. Set aside to cool.
Add the remaining flour and salt to the polenta dough and mix to a soft dough. Knead in the pine nuts cooked in butter (and the butter). Turn out on to a lightly floured surface and knead for 5 minutes until smooth and elastic.
Place in a lightly oiled bowl, cover with lightly oiled cling film and leave to rise in a warm place for about 1 hour or until doubled in bulk.
Knock back (punch down) and turn the dough out on to a lightly floured surface. Cut the dough into two equal pieces and roll each piece into a fat sausage about 38 cm/15 inches long. Plait (braid) together the two pieces and place on the baking sheet. Cover with lightly oiled cling film and leave in a warm place for 45 minutes. Pre-heat the oven to 200 C/ 400 F/ Gas Mark 6.
Mix the egg yolk and water and brush over the loaf. Sprinkle with the pine nuts and bake for 30 minutes or until golden and sounding hollow when tapped on the base. Cool on a wire rack.
From Bread by Christine Ingram and Jennie Shapter
• Please note that the nutrition information provided below is approximate and meant as a guideline only.
• Unless stated otherwise cup conversions have been made with an online tool. For accuracy please check with your favoured conversion tool. We recommend buying inexpensive digital kitchen scales.