Heat oven to 400 degrees.
Beat egg in a mixing bowl. Add the beef, salt, pepper, onion, lemon juice, bread crumbs, and pork and beans. Mix together thoroughly with hands. Yes. Sticky. That's what rubber gloves are for.
Shape into 3 or 4 loaves like a loaf of bread, and place on a baking sheet or in a glass baking dish.
Mix ketchup with water and brush across each loaf. Alternatively, mix the same amount of tomato sauce with a tablespoon of worcestershire shire sauce and ½ tsp of garlic powder and brush across each loaf.
Place in the oven and bake for 25 minutes.
Allow 5 minutes to cool. Remove from dish or sheet with your largest spatula. Place on individual plate and slice. Each individual loaf is about right for 1 person.