Combine first 3 ingredients in a small saucepan. Bring to a boil; reduce heat, and simmer, uncovered, 5 minutes or until mixture is reduced by half. Remove from heat, and strain mixture, reserving liquid; discard ginger.
Combine ginger liquid, milk, and next 4 ingredients in a small bowl; beat at medium speed of an electric mixer until blended. Pour mixture evenly into 2 (8-ounce) ramekins coated with cooking spray. Place ramekins in an 8-inch square pan. Add hot water to pan to depth of 1 inch. Bake at 325° for 55 to 60 minutes or until set. Remove ramekins from water, and cool 15 minutes. Cover and chill thoroughly.
Sprinkle 1/2 teaspoon brown sugar over top of each custard. Place ramekins on a baking sheet. Broil 5 1/2 inches from heat (with electric oven door partially opened) 1 minute or until sugar melts. Serve immediately. Yield 2 servings.