Sentence:  First, marinate the tofu. In a bowl, whisk the kecap manis, chilli sauce, and sesame oil together. <WSD>Cut</WSD> the tofu into strips about 1cm thick, mix gently (so it doesn't break) with the marinade and leave in the fridge for half an hour. 
Meaning of the word marked with <WSD> tags:  To divide with a knife, scissors, or another sharp instrument.