In a 12-inch skillet, sauté the onions with salt and pepper in the olive oil over high heat for 2 minutes. Lower heat to medium high, stir in the garlic and cook another minute. Remove from the heat.
In a saucepan, boil down the two vinegars by half. (This eliminates the danger of spattering oil that you'd have if you boiled them down in the skillet.)
Rewarm the onion mixture over medium high heat. Add the vinegar and potatoes. Gently turn the potatoes in the dressing to coat them. Divide the greens among 6 salad plates. Top with heaps of the potatoes and the warm dressing. Garnish with the bacon and chives.
Nutrition information per serving:
Calories260Fat13 gSodium202 mg
Carbohydrates31 gSaturated fat2 gCalcium78 mg