Heat oil in a large skillet over medium high heat.
Add onions and saute about 3 minutes. Add in the meat and the minced garlic, then cook, until nicely browned, breaking the meat as you go.
Drain the excess fat, then season with sea salt and pepper. Set aside.
Meanwhile, in a small bowl, add all the burger sauce ingredients and whisk well to combine.
Taste test, and adjust to your preference.
Place shredded lettuce in a large serving bowl or if meal prepping divide equally among one-serving containers.
Top lettuce with chopped tomatoes, red onions, beef, pickles, and cheese.
Just before serving, drizzle the burger sauce over the top, then toss well to combine and enjoy!