[header] How to braise short ribs [title] Chill the short ribs overnight. [step] Place the ribs in a lidded plastic container or resealable zipper bag and leave them in the refrigerator for 8-12 hours. They'll also do just fine wrapped in their original butcher paper if you just brought them home from the market. 
[substeps] Chilling the ribs solidifies the fat, making it easier to trim. Avoid putting the ribs in freezer, unless they're intended for long-term storage.