Yes, once you've searched for a food and the No matching result found message appears, click on the blue "+ Create" button in the top right hand side of the screen.
A screen with a food label appears for you to fill in. You can add a food, a drink, or a supplement like collagen powder. You will be able to find your entry in the My foods tab of the Journal page.
If you wish to create your own recipe then please follow these steps.