How to Make It
Put the sliced red onion in a medium bowl. In a small saucepan, heat the red wine vinegar with the sugar over moderately high heat until just beginning to simmer and the sugar is dissolved. Pour the hot vinegar over the sliced red onion and let stand for 30 minutes. Drain, reserving 1 1/2 teaspoons of the onion pickling liquid.
In a medium bowl, whisk all of the ingredients together and season with salt and pepper. Cover and refrigerate.
In a large skillet, cook the bacon over moderate heat until crisp, about 10 minutes; drain on paper towels. Cut each piece of bacon in half.
In a large bowl, mix the flour with the garlic powder, cayenne, onion powder, smoked paprika, 2 teaspoons of salt and 1/4 teaspoon of pepper.
In a medium bowl, soak the chicken livers in 1 cup of the buttermilk for 10 minutes, then drain. Add the remaining 1 1/2 cups of buttermilk to the bowl. Dredge the chicken livers in the seasoned flour until coated, then redip the chicken livers in the buttermilk and dredge again in the flour to double-coat.
In a large, deep skillet, heat 1/2 inch of vegetable oil to 325°. Fry the livers until golden, about 2 minutes per side. Drain the chicken livers on paper towels and immediately season with salt.
In a bowl, toss the tomatoes, parsley and celery ribs and leaves. Add the pickled onion and the reserved 1 1/2 teaspoons of pickling liquid. Spoon the ranch dressing onto plates. Top with the tomato salad, chicken livers and bacon and serve at once.
You can buy self-rising flour or make it yourself: Combine 3 cups of all-purpose flour with 1 1/2 tablespoons of baking powder and 1 1/2 teaspoons of salt.