Hilchot Chanukah 4:3-4 (A candle with two wicks, & a plate of oil filled with wicks)

Yesterday, the Rambam mentioned three ways of lighting on Chanukah: the basic mitzvah, the mehadrin, and the mehadrin min hamehadrin. In Spain, however, the minhag is unlike any of the above possibilities. What is it? Plus: may a candle with two wicks be used – and if so, does it count as one or two candles?