Red Velvet Cake - Chefwiz

Ingredients

• 2 1/2 cups all-purpose flour
• 1 teaspoon baking soda
• 1 teaspoon cocoa
• 1 1/2 cups granulated sugar
• 2 eggs
• 1 1/2 cups canola oil
• 1 teaspoon vinegar
• 1 (1-ounce) bottle red food coloring
• 1 teaspoon vanilla
• 1 cup buttermilk
• 1/2 cup margarine
• 1 (8-ounce) package cream cheese
• 1 box confectioners sugar (, sifted)
• 1/2 teaspoon vanilla
• 1 cup chopped lightly toasted pecans