But here is a short video that will show you exactly how. And it takes less than one minute.
I have tried it with three different oranges now, and two of them worked well. On the other one, the little stem refused to come out and it tore a hole in the orange peel. We used olive oil in one of the candles and it works pretty well. on the other one, we filled it two thirds full of vegetable oil and when we lit it, it burned over seven hours.