Italian Lentil And Chestnut Stew

Name: Italian Lentil And Chestnut Stew
Ingredients: 1 large carrot, finely diced; 2 sticks celery, finely chopped; 1 onion, finely chopped; 1 leek, sliced; 3 cloves garlic, chopped; Lenticchie umbre or other lentils, 350g (about 2 cups); 250 ml red wine (about a cup); 150 g cooked chestnuts (1 cup), roughly chopped; A small handful dried porcini mushrooms; 2 bayleaves; A sprig rosemary, leaves pulled from stem; 1 tbsp cranberry sauce (optional); 2 tbsp olive oil; Salt and pepper; Hot water