The Cedronian spices are a family that handle balance.
When used, whoever put the spice into the dish will face the downside, such as loosing something in trade for something else.
Trivia
Cedronian vanilla was the first spice used in season 1 (Shut 'Em Up Shortcake), and the last spice used in season 2 (Come Back Kombucha Tea); It was never used in Season 3.
Recipies using Cedronian spices;
Blanking Breakfast Bars (Assumed; no recipie is presented within the series, but the Traveler suffered the downside)