All you have to do is :
Open your inventoryRight click on an item. If the item is used in or more recipes, the "craft helper" option will appear in the contextual menu
Click on the "craft helper" option to see all the recipes where the item is used.
Move the mouse over a recipe to see its composition in tooltip box
Or
Click on the new available button (to the left of screen, under character info button) to open a window where all recipes (sorted by name) are displayed. Like above, when your mouse is over a recipe, its composition will appear in a tooltip box.