Cheeseburger Soup... Version II

If you have been following my blog here on Southern With A Twist, you know that I don't always follow recipes to the letter. I don't even make the same recipe the same way each time. I like to experiment and see if I can make a good recipe better. Well, last night, I got a thumbs up on the recipe I came up with last week... Cheeseburger Soup! I not only got a thumbs up, but I got "I like this one better than the one last week!" This recipe gives you a little more volume to the soup also.
So I decided to give you the updated version, and you decide which one you like best!

2 T butter

1 medium onion, chopped
2 cups beef stock
1 cup milk
16 oz Velveeta cheese, cubed
1 lb hamburger
2-3 T flour
lettuce & tomato, largely chopped

Saute the onions in butter until translucent. Add 2 cups beef stock and 1 cup milk. Add cubed Velveeta and stir until melted. Cook hamburger. Add about 2 - 3 tablespoons of flour to the hamburger. (This will make a slurry when the flour combines with the fat off of the hamburger.) Add the hamburger mixture to the soup. Bring soup up to a high simmer. If the soup is too thick, add a little more stock. When ready to serve, throw a handful of lettuce and tomato in a bowl and top with several spoonfuls of soup. Cheeseburger in a bowl!