Fumisterie-Style Black Beer Ribs and Creamy Coleslaw

For the ribs preparation :
   ❧ 2 tsp brown sugar
   ❧ 1 tsp cocoa
   ❧ 2 tsp paprika
   ❧ 1 tsp chili powder
   ❧ 1 tsp garlic powder
   ❧ 1 tsp onion powder
   ❧ 1 tsp kosher salt
   ❧ 4 back ribs (3 to 4 kg).

For the sauce :
   ❧ 2 tsp (30 ml) olive oil
   ❧ 1 onion (finely chopped)
   ❧ 1⁄4 cup (60 ml) ketchup
   ❧ 2 tsp (30 ml) brown sugar
   ❧ 1 black beer
   ❧ 3 tsp (45 ml) smoke sauce
   ❧ 2 tsp (30 ml) cornstarch 

Coleslaw ingredients :
   ❧ 1 cabbage (chopped)
   ❧ 2 carrots (grated)
   ❧ 2 green shallots (finely chopped)
   ❧ 1⁄2 cup (125 ml) mayonnaise
   ❧ 1 tsp (15 ml) sugar
   ❧ 2 tsp (30 ml) apple cider vinegar
   ❧ 2 tsp (15 ml) mustard
   ❧ Fresh pepper