If you’re using beef bones from your butcher, put them in in 100-150ml of water. Add the chopped onion and fresh herbs to your liquid. Bring to the boil and discard the bones and over a medium heat, stir in 1 tbsp of plain flour. Keep stirring until you’ve cooked the flour out and it’s all combined with the juices. Add a couple of sprigs of fresh thyme and season. Add approximately 400ml of good quality beef stock. Keep on the heat and simmer stirring regularly until thickened up.