Imagine you need to slice the green part, the stems, of a spring onion.
You've prepared it, washed it and dried it.
Naturally, you start slicing the green part you're interested in, starting with the tip.
It works, of course, but you can go twice as fast.
To do this, first separate the onion stems by cutting them apart.
Then cut them in half, down the middle.
And combine the 2 bundles of stems, which are necessarily shorter, into a single bundle, which is necessarily thicker.
Then slice as usual, but your previous cut makes...
...that you go 2 times faster...
Here's a short video of the gesture.
As you can see, there's nothing revolutionary about this gesture, but it's both very simple and very effective, and it would be a shame to go without it.
And in the same spirit, and depending on the length of what you have to slice, you might even be able to cut into 3?
To sum up: if you have to slice something lengthwise, remember to first cut it in 2 and then combine the 2 parts, to double your slicing speed afterwards.
