Black Beans With Rice

1 lb black beans, dry
7 C water
1 medium green pepper, coarsely chopped
11/2 C onion, chopped
1 Tbsp vegetable oil
2 bay leaves
1 clove garlic, minced
1/2 tsp salt
1 Tbsp vinegar (or lemon juice)
6 C rice, cooked in unsalted water
1 jar (4 oz) sliced pimento, drained
1 lemon, cut into wedges