Ginger Sesame Brittle

1 1/2 cups sesame seed
1 cup granulated sugar
1 cup dark corn syrup
1/4 cup water
2 tablespoons butter or margarine
1 teaspoon baking soda
1/4 cup finely chopped crystallized ginger

Toast sesame seed in shallow pan in a moderate oven (350 degrees F) for 15 minutes. Butter a 15 x 10 x 1-inch jellyroll pan.

Combine sugar, syrup, water and butter in a saucepan. Bring to boiling, stirring constantly. Lower heat without stirring, until mixture reaches 300 degrees F on a candy thermometer or until mixture when dropped in cold water, separates into threads which are hard and brittle. Remove from heat, stir in sesame seed, baking soda and ginger. Pour into prepared pan, spread evenly. Let cool and break into pieces. Store in tightly covered container.