How to use your voice to add items to a shopping list?

With iOS Siri, you can say "Add tomatoes to my shopping list" and it will add it to a list titled "Shopping List" in the "Notes" app, easy. In Android, using S Voice or Google Voice, if you say "Add tomatoes to my shopping list" it will google that, which is unhelpful. Ideally there should be a way to add items to lists generically in Google Now. Is there such a workflow? I am aware Grocery IQ app has Voice entry, but then the workflow is tedious: Hold a button, say OK google, say Open Grocery IQ, then tap a mic, then Say tomatoes.