1⁄4 cup olive oil1 1⁄2 lbs beef round steak, cut into small pieces1 1⁄4 teaspoons salt1⁄4 teaspoon ground black pepper1 large onion, sliced2 green peppers, cut into thin strips (optional)6 garlic cloves, minced6 tablespoons tomato paste(35 ounce) can Italian plum tomatoes, crushed with your hands, with their juiceWater (to taste)1 bay leaf1⁄2 teaspoon crushed red pepper flakes1 carrot chopped3 potatos, peeled and cubed1 sweet potato, peeled and cubed 2 tablespoons minced fresh parsley leaves