Beef and lentil meatball subs with tomato sauce and ricotta

Name: Beef and lentil meatball subs with tomato sauce and ricotta
Ingredients: 50ml/2fl oz milk; 80g/3oz breadcrumbs; 500g/1lb 2oz beef or pork mince; 150g/5½oz cooked small green or black lentils; 1 free-range egg; 30g/1oz parmesan, grated; big pinch dried oregano; 4 tbsp olive oil; 2 small onions, chopped; 3 garlic cloves, finely chopped; 1 large sprig fresh thyme, leaves only, 2 fresh bay leaves or 4 fresh sage leaves; 400g tin chopped tomatoes; 1 large baguette; 100g/3½oz ricotta; salt and freshly ground black pepper