Lamb's fry with bacon

Name: Lamb's fry with bacon
Prep time: 15 min
Cook time: 1 h 20 min
Total time: 1 h 35 min
Cuisine: British, European
Ingredients: 500 g lamb's liver (lamb's fry - see Tips); 300 - 500 g milk; 200 g brown onion, cut into halves; 6 rindless bacon rashers (approx. 230 g), cut into 3-4 cm pieces; 50 g salted butter; 60 g tomato sauce; 40 g Worcestershire sauce; ¼ tsp salt; ¼ tsp ground black pepper; 100 - 150 g plain flour, for dusting; 2 - 3 sprigs fresh flat-leaf parsley, roughly chopped; mashed potatoes and cooked peas, to serve (see Tips)