The golden French fries and basket of wings ordered at the bar or restaurant are made delicious through the frying process. But the oil used in restaurants and commercial kitchens can’t go down the drain, so it’s set aside for pickup. Companies big and small specialize in the collection and recycling of the grease. In Pittsburgh, Fossil Free Fuel is one business that reuses the residual oil. In this segment of On The House, Larkin Page-Jacobs looks at where the grease goes.