Shredded Pork in Molasses Marinade

2 tbsp. vegetable oil

168 g dark beer

1 cup white wine vinegar

1 cup ketchup

1/2 cup worcestershire sauce

4 tbsp. molasses

1/4 cup brown sugar

1 tbsp. pepper

1 1/2 tsp. ground allspice

1 1/2 tsp. ground coriander

1 1/2 tsp. cayenne pepper

2 bay leaves

1 tsp. dry thyme

1/4 tsp. chili powder

1 tbsp. chopped onion

2 cloves garlic, minced

3 to 4 cups chicken broth