Mix sugar, flour and margarine. Pat 2/3 of the mixture into baking dish. Drain juice from peaches in to a cup. Pour the peach juice, extract, nutmeg and cornstarch into a pot. Cook the juice mixture over low heat until clear and thickened. Add the peaches and stir to mix. Pour peach filling over crumb base. Sprinkle the remaining crumbs over the filling. Place dish in preheated Holland Grill for 20-30 minutes or until golden brown.