For just the 2 of you/them, if you have some sides, you won't spend a lot:
1 lb beef
1 15oz can petite diced tomatoes (you can use regular, but the smaller pieces make it easier to eat)
A bit of AP flour
Maybe a little extra oil/butter
1 cup or so of broth (I had to use water tonight, and it's still just as good, but it'd be slightly better with chicken or beef broth)
*In a mixing bowl, toss in the beef and mix in salt, pepper, garlic powder, paprika, and thyme, but you can adjust whatever you like.
*Patty the beef out, I like mine on the thicker side.
*Sear the patties in a pan to get a nice Maillard reaction on the meat on both sides and remove the patties.
*Toss in the AP flour into the pan to make a roux. You'll probably need about 1 tbsp or so of oil in the skillet. I usually have to add a wee bit more oil. I usually get my roux about peanut butter consistency.
*Cook the roux for about 5-8 minutes to get a little color in it, then add in the can of tomatoes, juice and all and then start with about 1 cup of the broth or water. This will break the brown bits loose on the bottom of the skillet from the meat and get all that tasty flavor in there.
*You want the gravy thick enough it'll lightly coat the back of a spoon, add a little more broth if it's too thick. Taste it and adjust seasoning, but don't go wild, because the patties will be going back in. I usually just use more salt, pepper, garlic powder, and a small bit of thyme.
*Add the patties back in and cover. Simmer on low heat until the internal temperature is 165, stirring/scraping the bottom every few minutes. I usually taste the gravy and add seasoning once the meat reaches 165, and then just stir it in really good.
This tomato gravy would also go great over some nice fried pork chops or chicken fried chicken or chicken fried steak. It goes on biscuits a lot but I don't like it as much on biscuits, so I usually stick to just milk/sausage gravy for biscuits.