Colour bomb + striped combination is a huge help, and so is colour bomb + wrapped because it reduces the amount of colours, which makes the level easier. Wrapped candies alone are also good for tackling the liquorice directly.
It is very important to tackle from both sides, as bottom corner jellies can become a problem.
The real strategy for this level, however, is to play it enough times so that sufficient opportunities for wrapped & striped candies come up. Without these useful combinations, it is unlikely to complete this level on most given tries, and it will take several attempts for blind luck to favour upon you.
Aside from the obvious tactics previously mentioned, colour bomb + colour bomb instantly clears all the liquorice, but it is very unlikely to happen. This level is all about just luck of the draw and get the colour bomb + colour bomb combination. Note that this combination does not work on the web version.