1. Cook bacon in a skillet over medium-high heat 6 to 8 minutes or until crisp; remove bacon, and drain on paper towels, reserving 1 Tbsp. drippings in skillet.
2. Sauté onion in hot drippings 2 to 3 minutes or until soft. Add vinegar, lime juice, and honey; cook 2 minutes, stirring to loosen particles from bottom of skillet.
3. Place spinach in a serving bowl. Add warm vinaigrette, and toss to coat. Top with mango, queso fresco, and bacon; season with salt and pepper to taste. Serve immediately.