Creating a shopping list with Reminders and Siri Link

I've been doing this trick (from TUAW) with my wife for the past week. She doesn't have an iPhone 4S (yet) but she prefers the reminders app to any other option, including a list on the refrigerator. Siri makes it all that much easier for me to add things to the shopping list while I prepare meals (I do the household cooking and my wife does the grocery shopping).