Sausage and Bacon
The combination of both bacon and sausage is one of the essential elements to a full fry up. A simple pork sausage (like the banger) is ideal, the type of bacon is up to preference.
Tomatoes
The tomato may seem like an optional garnish; I assure you, it is not. The sweetness and acidity that come from a cooked tomato goes a long way in cutting the fattiness that is inherent in the rest of the plate. The way you prepare your tomato is once again a matter of taste—a stewed tomato will work, but simply cutting a tomato in half and frying it in leftover bacon fat, then finishing it with a bit of cracked black pepper, is a quick and delicious way to go. Many proper fry ups will come with grilled tomato (that's broiled, for you American English speakers).
Fried Bread
Fried bread is just what it sounds like—sliced bread toasted in a pan with butter, lard, or bacon drippings. It is important to not underestimate the amount of fat you will need to get a perfectly crisp piece of fried bread—a couple tablespoons per slice is not unheard of. It's a bit surprising, but absolutely worth it. You only need a slice or two to satisfy the craving; after that, you may find yourself reaching for a plain piece of toast.
The Eggs
Lastly, the egg. Normally two, but sometimes three eggs cooked to your preference. The runny yolk to my mind is essential—it's the sauce that brings the whole plate together!—although those die-hard scrambled fans will without a doubt disagree with me.
Kidneys
A few quickly fried kidneys make a great addition to any fry up. Lamb kidneys are the right size for a morning meal, and have a more delicate flavor than beef kidney. Kidneys are simple to prepare: simply remove the interior sinew, toss with seasoned flour, and fry in butter. If you're feeling adventurous, deglaze the pan with a few big shakes of Worcestershire sauce and some stock for a quick pan sauce.
Kippers
Gently poach the kippers in milk and remove the bones, then flake them into scrambled eggs. Or simply fry your kippers and use them as the bed for your fried or poached eggs.
Mushrooms
Mushrooms often come along with a fry up, either roasted in the oven or fried in some butter. Generally you're looking for a white button mushroom cooked whole and seasoned gently to let all of its mushroom flavor come through. Serving mushrooms in a fry up is a nice inclusion because it offers a moment of pause from the sausage and bacon every few bites, but holds true to many of their meaty qualities.
I got it from here.
