From The Best of Irish Breads and baking. I just adore this, it's VERY moreish.

2oz/50g butter
20z/50g/2US tbsp black treacle/molasses
!2fl oz/350ml water
1oz/25g yeast
1lb/450g rye flour
1lb/450g strong white flour
1tsp/1 1/4US tsp salt
2oz/50g/2 US tbsp sunflower or pumpkin seeds
1tbsp grated rind and the juice of 1 orange
1 small(5oz/125ml) natural yoghurt

Melt the butter and treacle/molasses by warming with the water. Then add the yeast and allow it to froth. Mix the flours, salt, seeds and grated orange rind in a separate bowl. Then add the warm yeast liquid, yoghurt and orange juice and mix to make a firm dough.
Cover the bowl with a tea/dish towel and leave to rise for 1 hour or until doubled in size.Knead till smooth. Place in 2 oiled 2lb/900g loaf tins and leave to rise again.
Meanwhile preheat a very hot oven 450F/230c gas 8. Bake for 35 mins.

I actually use a packet of fast action dried yeast and mix it with the flour, and I find that my fan oven only needs to be 200f for 30 mins.The only problem with this bread is can't stop eating it! BE WARNED! Judi