White Beans with Salt Pork

Name: White Beans with Salt Pork
Ingredients: 2 cups dried cannellini beans, picked over and rinsed; 1 teaspoon baking soda; ½ pound salt pork, rind removed or pancetta; 1 sprig fresh rosemary; ½ cup extra-virgin olive oil, plus more for drizzling; 1 medium onion, thinly sliced; 2 cloves garlic, thinly sliced; ¼ pound prosciutto, cut into ¼-inch pieces; 3 tablespoons finely chopped fresh flat-leaf parsley; 4 canned plum tomatoes, drained, seeded, and finely chopped; Freshly ground black pepper; 6 slices (½ inch thick) crusty country bread, such as ciabatta, toasted