1 lb of pork1/4 cup of olive oil1 onion, chopped2 garlic cloves, chopped1 bay leaf3 tomatoes, chopped and without seeds or skin2 carrots, cut into small slices2 tablespoons of tomato paste1/2 cup of white wine3 cups of chicken broth3/4 lb of shell pasta1 bunch of fresh oreganoSalt and pepper (to taste)