I know this has been suggested before in a variety of ways but I feel the issue really needs more attention. We need a proper recipe book for synthesis. A system that logs all recipes we have and categorizes them based on whatever craft we're currently using.

Ex:

Armorer
|
| -- Armor
| |
| -- Helmet
| |
| -- Copper Barbut
| -- Bronze Chain Coif
| -- ...
|
-- Tools
|
-- Bronze Skillet
-- Copper Alembic


Means of obtaining the recipe could be as simple as, once you've completed the synthesis once it is stored. They could be obtained through NPC shops or even enemy drops. They could be quest rewards or part of an event. There's a variety of ways to do this.

I just feel we need an organized menu for selecting permanently stored recipes. Having a "Last 10" menu is only so useful. Also keep the option to simply put the materials in if you know them off the top of your head, but allow the recipe book to be a second option the same way the current Recipe menu is now.

Edit: There was better formatting on the example but the forum hates spacing