Add the butter and blend to a very fine puree.

Transfer the mixture to a blender or food processor and whizz to a fine purée.

Put the peppers and oil into the container of a food processor or blender and blend to a fine puree.

Return mushrooms to a food processor, add parsley and one tablespoon of the cream and process to a fine puree.

Peel yams and pass them through a ricer or food mill to make a fine puree.

Drain, place in a blender and make a fine puree.

Process until mixture is smooth, with a little texture (not a fine puree).

Process prepared fruit in a liquidiser to a fine puree.

Blend the ingredients to a fine puree.

Make a fine puree of all the ingredients in a food processor.