First, make a sauce of ketchup, spicy mustard, and Worcestershire sauce.

Then dice a tomato and add it to the sauce.

Next, knead a raw egg, bread crumbs, and your choice of spices into the ground beef in a large bowl. For spices, I used salt, pepper, cajun seasoning, garlic salt, and red pepper flakes.
I didn't have bread crumbs, so I just toasted a hot dog bun and crumbled it in. Improvisation!

Add the sauce and tomatoes to the mixture, along with the mushrooms, and shape into a loaf in a lightly greased baking pan. Top with any extra veggies.

I also like to add more ketchup to keep it moist on top.

Then you just bake in a 350 degree oven for one hour...

and you're done! I served it with mac'n'cheese and beans. Yum!