A second important thing is to have a food processor - for chopping vegetables, otherwise you will do like me 2-3 years ago - onions and peppers are cut into juliennes; carrots, celery, bleach are grated; pass the tomatoes with something or cut them into small pieces.
Now, on the occasion of the robot, the work was about 10 times faster, I shredded all the vegetables one by one and along the way I put them to harden.