I realized after my 10 gallon batch of Wit was already in 2 fermenters (a carboy and a plastic bucket) that I had completely forgotten to add the spices at flameout. :0
I put the spices in a couple of quarts of water on the stove and brought it to a boil for a few minutes. Since whatever went into the carboy would have to go through a funnel, I poured off the liquid from the pan into the carboy through a sanitized funnel. I then dumped the wet spices into the plastic bucket. I'm planning on switching it to another bucket in a couple of days so it won't sit on the spices too long.