Core your lettuce and discard any straggly outer leaves.
Place it into the Thermomix bowl, break it up if needed to fit.
Add water.
Set your Thermomix to 30 sec/Interval/dough setting
Drain lettuce in your Varoma dish, place lid on and shake out excess water.
Voila! You just cleaned and chopped your lettuce.
We have been told this also works with leeks.