Stuffed Peppers with Rice and Tomato Sauce

Name: Stuffed Peppers with Rice and Tomato Sauce
Prep time: 25 min
Cook time: 1 h
Total time: 1 h
Yield: 4 portions
Ingredients: 70 g onions; 225 - 340 g ground beef; 2 slices white bread; 30 g mustard; ½ tsp salt; 1 tsp paprika, sweet; ¼ tsp black pepper, ground; 1 large egg; 4 mixed bell peppers, red, yellow, orange; 1220 g water; 2 heaped tsp vegetable stock paste; 225 g white basmati rice; 45 g unsalted butter; 45 g all-purpose flour; 1 can crushed tomatoes; 60 g tomato purée (concentrate); ½ tsp salt; ¼ tsp black pepper, ground; 1 tsp sugar; 1 tsp lemon juice