Knowing what to refrigerate (and what not to refrigerate, for that matter) is a foundational bit of knowledge to make your kitchen run smoother. So, open the fridge doors, clear out some space, and start chilling. 

1. Citrus

2. Tortillas

3. Natural Peanut Butter

4. Butter

5. Ketchup

6. Pies

7. Maple Syrup