Broccoli & Stilton soup

1. Heat the rapeseed oil in a large saucepan and then add the onions. Cook on a medium heat until soft. Add a splash of water if the onions start to catch.
2. Add the celery, leek, potato and a knob of butter. Stir until melted, then cover with a lid. Allow to sweat for 5 minutes. Remove the lid.
   5 minutes
3. Pour in the stock and add any chunky bits of broccoli stalk. Cook for 10 – 15 minutes until all the vegetables are soft.
   10–15 minutes
4. Add the rest of the broccoli and cook for a further 5 minutes. Carefully transfer to a blender and blitz until smooth. Stir in the stilton, allowing a few lumps to remain. Season with black pepper and serve.
   5 minutes

Cooking notes

Scaling works best when you weigh ingredients rather than measure by volume — small differences in packing can compound at higher multipliers.

For volume-to-weight conversions of any ingredient — flour, sugar, butter, salts — use the ingredient converter. To translate the recipe's oven temperature between °C, °F and gas mark, see the temperature converter.

When you scale this recipe up or down, remember that cooking time does not scale linearly. A doubled cake takes longer, but not twice as long; a doubled soup takes roughly twice as long. The cooking-time guide gives sensible starting estimates by dish geometry.