Ultimate mushroom mac n' cheese

Name: Ultimate mushroom mac n' cheese
Prep time: 10 min
Cook time: 1 h 5 min
Total time: 1 h 5 min
Yield: 6 portions
Ingredients: 100 g Provolone cheese; 250 g cheddar cheese; 1500 g water; 1 ¼ tsp sea salt; 300 g dried macaroni pasta; 40 g dried porcini mushrooms; 2 eschalots; 2 garlic cloves; 100 g unsalted butter; 100 g rindless bacon rashers; 60 g plain flour; 1 tsp Dijon mustard; ¼ tsp ground black pepper; 800 g milk; 10 g sherry vinegar; 2 slices crusty bread; 1 tbsp extra virgin olive oil; 2 sprigs fresh flat-leaf parsley