Bravo!

Wonderful use of second person. i like that, makes your passage a bit unusual. i could taste the food and see the place. The only detail i might add would be the sizzling of the meat on the grill.

Precious few nits to pick here. But i do have to do (i have a reputation to keep, you know).

**You start with some onions, sauté them, stir in some green peppers, add spices that they will not tell me about, and then take the result off the grill. You then mix this into a quarter pound of USDA choice ground sirloin. You then put this back on the grill. As the patty cooks you gather up some mushrooms and throw them on the grill to cook in the grease from the burger. After the patty is almost done you get a thick slice of cheddar cheese and place it atop the patty, along with the mushrooms. You then take the bun and place on the grill to toast.
You then get fresh lettuce, ripe tomatoes, and onions together. You take the bottom bun and put on a plate and load the lettuce on to it, and then take the top of the bun and use it on to hold the mushrooms and melted cheese on the patty as you scoop it up and load it onto the bun.**

You should vary your sentence structure a bit in this passage and eliminate most of the "then"s. In this context, it is usually unnecessary.

**Back to Mishka, I watch as she takes her first bite of the cheeseburger, the rich flavor of the premium meat and the juices flood her mouth. **

After "cheeseburger" you need a semicolon there instead of a comma.

**Being more experienced I savor that first bite, every burger at this place is unique in its flavor because there is no set quantity for the mix that they put in the meat. **

You need a comma after "experienced".

**...the butter flavor adding a rich flavor...**

You need to find a synonym for one of the "flavor".

**...every true Texan learns to love if.**

I am pretty sure that you meant "it", but my OCD forces me to mention it.

Now for extra credit, i need the name and address of this little haven of beefy nirvana. Sounds like it might be worth the drive from Dallas.

Excellent job, i will get your next assignment up today or tomorrow.

rose