This easy strawberry rhubarb cake is perfect for those who want a delicious dessert without spending hours in the kitchen. To make this cake, you will need a box of yellow cake mix, butter, eggs, milk, fresh strawberries, and fresh rhubarb. Preheat your oven to 350°F and grease a 9x13 inch baking dish. In a large bowl, mix together the cake mix, melted butter, eggs, and milk until well combined. Fold in the chopped strawberries and rhubarb. Pour the batter into the prepared baking dish and bake for 30-35 minutes, or until a toothpick inserted into the center of the cake comes out clean. Let the cake cool for 10 minutes before serving. This cake is perfect for a summer barbecue or potluck.