If you have full length lemongrass stalks, you need to clean the stalks and cut off an inch from the root end. Bend the stalk and where it snaps is where to cut. You will be left with about a 8-10 cm stalk. Set aside the remaining length, if you're needing lemongrass skewers. Peel the outer layer and discard.
If you've purchased packaged lemongrass from a supermarket they should be ready to use as is.
Slice lemongrass thinly (this avoids getting the stingy bits in the paste).
Place prepared lemongrass and all remaining ingredients into the Thermomix bowl. Blend 2 min/speed 10.
Pour into a sterlised jar and use as recipe advises.