The Discovery tab is where you can experiment to unlock more recipes. Your available materials, including crafted components, will be displayed on the left. Try dragging or double clicking your Poultry Meat, Black Peppercorn, Carrots and Potatoes so they appear in the discovery boxes to the right. Note that the "Craft" icon will turn blue, indicating that you've found a viable combination. Press "Craft" to craft the item.