Put all the ingredients into a large pan and cover with water. Bring to the boil. Cover and simmer very gently for 20-30 minutes. Strain into a large bowl and allow to cool.
Use within 3 days or freeze. To freeze, reduce the stock by half by boiling vigorously and cool. Pour into ice-cube trays and freeze. When frozen put the cubes into a bag, label it, and when you want to use one, just put in a jug and add boiling water to dissolve the cube.
Type the ingredients you want to use, then click Go. For better results you can use quotation marks around phrases (e.g. "chicken breast"). Alternatively you can search by chef, programme, cuisine, diet, or dish (e.g. Lasagne).