Mandarin Orange Pig Pickin' Cake

box of butter style yellow cake mix

vegetable or canola oil

large eggs

(11 or 15 ounce) can of mandarin oranges , undrained

(4-1/2 serving size) package of instant vanilla pudding

of crushed pineapple , undrained

carton of whipped topping (like Cool Whip )

Sprig of fresh mint, for garnish, optional