Preheat oven to 180C and heat baking sheet in there
Pour Guinness into jug and add water and keep warm
Mix flour, salt, sugar and yeast in large bowl and make a dip in centre
Pour liquid into bowl and bring it all together with wooden spoon to form a dough
Tip on to floured surface, oil your hands and start to knead by folding, turning and thumping for 10 minutes
Oil bowl and put the dough in there and cover with a clean tea towl and set aside somewhere warm to rise for 1 hour
Tip out back on to floured surface and punch out air then shape into loaf and score the top a couple of times with a knife and dust with flour
Put on the hot baking tray and bake for 1 hour, test by holding in one hand and tapping base, it should sound hollow
Cool on a wire rack for 15 minutes