If fire is already present, you may be able to persuade it, depending on how much of a relationship you have with the essence first. In Elemental Shamanism they focus on creating a constant energy arrangement with all of the essences and their elements. I'd do a bond first, with the essence.
There are some stories of people just making things catch on fire but they are very rare. You're better off invoking the element to get a good relationship, then if you want manipulating it (it's very subtle still), providing you have the talent.