1 c. Margarine
1 c. Sugar
2 Tbsp. Water
1 Tbsp. Light corn syrup
1 tsp. Vanilla
2 1/2 c. Freshly-popped popcorn
Melt margarine over low heat in a heavy saucepan
Remove from heat, stir in sugar
Put back over low heat until mixture comes to a full boil, stirring constantly.
Stir in water and corn syrup.
Cook, stirring occasionally, to soft
Remove from heat, stir in vanilla then popcorn. Mix lightly.
Spread quickly in buttered 15x10x1 sheet pan. Press down with spatula.
Cool until firm. Then break into large irregular pieces (like peanut brittle).
Store in airtight containers.