Trex is a solid vegetable fat brand sold in the UK, it is available in most major supermarkets. You can also use Flora White as an alternative, or lard if you don't mind animal fats.
24 Oct 2010
Sainsburys web-site:
Description
Vegetable Baking Fat
Home baking at its best
The versatile baking product that is lower in saturated fat than butter!
Light mixture
Dairy free
Use 20% less than butter
Free from preservatives, colours, e-numbers and hydrogenated vegetable oil
Generations of home bakers have chosen Trex to make delicious recipes. Easy to use and versatile, you can use Trex straight from the fridge for perfect pastry, cakes, biscuits and roasting.
Why use Trex instead of Butter?
It's soft and easy to whip giving an even bake
You can use 20% less in your recipes because it contains no water.