Preheat the oven to 400 degrees F.
In a medium saucepan, combine the Moscato, corn syrup, ginger and thyme. Cook over medium-high heat until the mixture is reduced by 80 percent, forming a glaze, 8 to 10 minutes.
Put the grapes in a pan, drizzle the glaze over the grapes (or lightly toss) and roast until the grapes have wilted but still retain their shape, 6 to 10 minutes.
Serve with a cheese platter.