Arepas with Carne Mechada and Fresh Guasacaca

[size=4]Ingredients (5 servings):[/size] **Carne Mechada** 500g flank steak 6 cups beef stock 2 onions 8 cloves garlic 2 bay leaves 1 green pepper 1 Tbsp tomato paste ½ cup pasata 2 tsp oregano 1 tsp worcestershire sauce **Guasacaca** 0.5 white onion 4 cloves garlic 1 handful coriander 1 handful parsley 0.5 jalapeño 0.5 avocado 1 Tbsp white vinegar 2 Tbsp olive oil 1 Tbsp water 2 pinches salt *