For ketchup sauce: Mix together ketchup sauce ingredients and set aside.
For meatloaf: Preheat oven to 350 degrees. Oil a loaf pan with either cooking spray or oil. Rehydrate onions by soaking in ½ cup warm water for 15 min. Combine ground chuck, onions, celery, cilantro, Taco Seasoning, tomato sauce, eggs, lemon juice and ground tortilla chips in a bowl and mix thoroughly with hands. When completely combined, form into a loaf and place in loaf pan. Bake for 45 min. on middle rack, rotating once. Remove from oven and coat with spicy ketchup mixture. Place back in oven and bake 15 more min. Remove from oven and let sit 10 min. before serving.
Serve with extra ketchup sauce and mashed potatoes or French Seasoned Steak Fries.