Cake Ingredients:
1 cup flour
1/2 teaspoon baking soda
1 cup sugar
dash salt
1/4 cup (1/2 stick) butter
1/4 cup vegetable oil
2 tablespoons cocoa powder
1/2 cup water
1/4 cup buttermilk
1 egg
1/2 teaspoon vanilla

Frosting Ingredients:
1/4 cup (1/2 stick) butter
2 tablespoons cocoa
3-4 tablespoons milk (as needed for consistency)
1/2 cup pecans, chopped
2 cups icing sugar
1/2 teaspoon vanilla
ice cream
caramel sauce (for serving; this one is delicious!)
whipped cream (for serving)