Grilled Onion and Cheddar Burgers

I love to have those frozen hamburger patties in the freezer for easy dinners and they are great to have in case company shows up.. makes for an impromptu BBQ relatively stress free. But I personally can taste the difference between them and homemade burgers, so I came up with a way to fix them.
Here is my secret.. shhhhh, don't tell anyone.

Yep, its soy sauce and garlic pepper. I added a little salt but be careful since the soy is so salty. How much you ask? I have no idea.. until it looks good to you.
Here is a picture, does that help?

So season up the burgers and then slice some onion..

Throw them in a skillet with some oil to caramelize (don't forget to stir them once in a while.) while ya BBQ the burgers.. don't forget to put cheese on the burgers.

Now just build your burger with the onions, and some mustard, and mayo.. usually I put ketchup on my burger but I like it without with these.. Oh and I also grilled the buns a bit.
I served them with sweet potato oven fries!