Heat your oil in a large skillet over medium heat. Add beef and cook, breaking up the meat with a wooden spoon, until nicely browned, about 8-10 minutes. Season with a pinch of sea salt and pepper.
Set meat aside and allow it to cool.
Meanwhile, prepare the remaining ingredients for the salad: dice the onion, tomatoes, and chop your lettuce.
In a small bowl whisk all your burger sauce ingredients until well combined and divide equally among 4 wide-mouth mason jars.
Equally add the cooked ground beef, then top with onions, tomatoes, pickles, cheese and lettuce.
Set your lid on and refrigerate.
Keeps great for 4-5 days stored in the fridge.
Enjoy!