-1 large onion
-1/2 tsp salt
-1 Tbsp grape seed oil
-2 of your favorite veggie burger patties
(make sure you are able to cook them on a skillet or grill)
(American if you want it to be In-N-Out authentic, but we used Daiya's cheddar wedge & loved it)
-Vegan Thousand Island Dressing
(or as they call it "spread")
Heat a large saucepan on medium heat and add 1 Tbsp grapeseed oil. Finely chop onions and add to the pan along with salt. Stir regularly and keep an eye on them. This is honestly the most tedious part of the whole thing. When the onions start to look dry, add 1 Tbsp of water. Keep cooking and adding water when needed until the onions are caramelized to a nice brown color and smell delicious. Turn off the heat and set aside.
Add 1 Tbsp oil to a griddle or saucepan and turn to medium heat. Once the grill is evenly heated, season burgers with salt and pepper and start cooking. This is where we start using true In-N-Out tricks. When you start cooking your burgers, we are looking to do about 3 minutes on each side. As the burgers are cooking, apply 1 Tbsp of mustard to the "raw" side of the burger that is still facing up. When the first side is good and done, give it a flip onto the mustard side down and immediately add a slice of cheese to the top, you can also add some of your grilled onions on top of the cheese at this point. This is a great trick especially for vegans trying to get their stingy cheese to melt. After 3 minutes on the mustard side, you're done!
Repeat with the second burger, since a true Double Double has two patties!
Preheat your oven to 400 degrees. Also, get a new pan, griddle, grill or some kind of heating surface, add a small amount of oil, just so the surface is "shimmering" and start it up on medium heat. Whole buns go in the oven for 2 minutes, just to warm them. Take them straight out of the oven, split them and put them face side down on your heating surface of choice until golden brown, about 1 minute.
This is the fun part and I'm going to make it very simple.
Here's the order from the plate up:
1 large slice tomato
2 cheese and onion covered patties
...and that's it!