1. 1. Preheat the grill to medium-high heat.

2. 2. In a bowl, mix the ground hamburger with minced garlic, fine sea salt, and pepper. Form into burger patties.

3. 3. Grill the burger patties to your desired doneness, flipping once.

4. 4. In a pan, caramelize sliced red and sweet onions with olive oil until golden brown and soft.

5. 5. In a small bowl, combine freshly squeezed lemon juice, minced garlic, and milk to create the lemon garlic sauce.

6. 6. Assemble the burger by placing the grilled patty on a bun, topping it with caramelized onions, and drizzling the lemon garlic sauce on top.

7. 7. Serve hot and enjoy!