I'm a big fan of cherry and like it best unstained, but when an immediate slight darkening is desired I use Easy-Off oven cleaner. As Rich mentioned, not all oven cleaner has lye in it; the Easy-Off that comes in a yellow can does and the label says "DANGER: CORROSIVE. CONTAINS SODIUM HYDROXIDE (LYE)."
My technique is to spray some in a plastic dish then add water to make it ~10:1 ratio -- very diluted, allowing me to control the darkening with repeated wiped on applications.
Here's a pic showing the extremes of concentration. The rifle is cherry hit with full-strength Easy-Off sprayed directly on the stock. The picture frame is three wiped-on applications of the 10:1 diluted solution... darkened it just a bit without "disrespecting" the natural beauty of cherry. Both are finished with tung oil.
Hope this helps.
- Tom