Preheat the oven to 350 degrees F (175 degrees C).

Line a baking sheet with graham crackers. Sprinkle evenly with pecans.

Combine sugar, butter, and margarine in a small saucepan over medium heat. Bring to a boil and boil 3 minutes. Remove from heat and spoon mixture over pecans, coating well.

Bake in the preheated oven until golden, about 12 minutes. Cool completely before serving.