Slow Cooker Pot Roast with Balsamic Caramelized Onions

INGREDIENTS

3 1/2 lb

boneless roast

3 tbsp

favorite spice rub

2 tbsp

butter (real butter, please)

1 cup

beef stock (reduced to 1/2 C)

1/2 cup

balsalmic vinegar

1/4 cup

water or good red wine to deglaze your skillet

Large white onions (peeled and thickly sliced about 1/2 inch rings)

2 cups

baby carrots

1/2 cup

tomato paste

*3 sprigs fresh rosemary for garnish