Count orders which contain a certain product

I have a table with data about orders where the products that are ordered each have a separate row, one row per product. Each order starts with an order number and then the product description. I'm looking to count the number of orders which contain each product. I don't want to know the quantity of each product ordered, just the total number of orders which contain each product. (Apple = 2 orders, etc.). The order numbers repeat for each individual product that is ordered, so I'm having a difficult time finding a way to automate the count of individual orders that contain each product. Counting the number of orders or the total number of each product ordered is simple.