Heat 1 tablespoon oil and 1 garlic clove in a 12-inch straight-sided skillet over medium-high heat, until garlic is golden, about 3 minutes. Add a quarter of the spinach, and cook just until it wilts, about 2 minutes. Transfer to a colander; drain. Repeat with remaining oil, garlic, and spinach.
Transfer spinach to a bowl. Season with salt and pepper. Squeeze lemon over spinach, and top with pine nuts.