Preheat the oven to 180 degrees celsius. Take at least three slices of wholemeal bread – stale is best. Chop it up into chunks, then throw into the blender on high until it resembles coarse crumbs.
Spread the breadcrumbs on to a baking tray, about 1-2cm deep. Place into the oven for about 5 mins, keeping an eye on them and stirring once. Turn the oven off, and leave the crumbs in the warm oven for a further 5-10 mins.
Put the crumbs into the blender and blend on high-speed again – this time they will come out very fine, and a lovely golden colour.