Wilt the spinach in a wide, covered sauté pan over medium heat, for about 4 minutes, and pour off liquid. Remove spinach from pan, turn up heat, and let any remaining liquid burn off. Swirl in olive oil, and add the garlic. Cook, stirring frequently, for 4 minutes, until golden. Add spinach back to pan, and sauté for another 2 minutes, until completely wilted. Turn into a serving bowl, and squeeze lemon juice over top.