In a small pot, heat mustard seeds, bay leaf, sugar, vinegar, white wine, and rosemary over medium-low heat. Bring to a boil, then add cranberries and cook for 10 minutes. Remove mixture from heat, add other ingredients and stir. Let cool.
Place brie wheel in ovenproof baking dish or plate and bake on middle rack for 12 to 16 minutes. Invite your friends and serve with garnish and crusty bread.