In a large skillet, heat the olive oil over medium heat. When hot, add the spinach and most of the garlic (save about 1 tablespoon of garlic to add near the end. Also, you might need to add about half the spinach and allow it to wilt a little before adding the rest.) When the spinach has cooked to where it's about at the top of the pan, add the remaining garlic and cook, stirring very frequently, until the spinach is almost completely cooked down and most of the liquid has evaporated. Season to taste with salt and pepper and vinegar or lemon juice. Serve immediately or save for meal prep bowls, omelets, etc.