Slow Cooker Pot Roast

Scaled for 10 portions · 5 steps

1 tbspolive oil1.81 kgchuck roast (or blade roast, boneless and trimmed of excess fat)2yellow onions (chopped)8 clovegarlic (smashed with the back of a spoon)455 gbaby potatoes (white or Yukon gold, you may need to halve them if they are too large)4carrots (large, cut into 2-inch pieces)2celery stalks (cut into 1-inch pieces)2 tbspDijon mustard1 tbspbrown sugar2 tspdried thyme2 tspcrushed bouillon1 tspsalt (or to taste)0.5 tspblack pepper (or to taste, freshly ground )1 cupreduced-sodium beef broth2 tbspplain flour (optional - for a thick gravy)2 tbspparsley (fresh, chopped, to serve)0.25 cupbalsamic vinegar

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