Directions

1. Preheat oven to 425 degrees F. For potato salad, in a shallow roasting pan toss together potatoes, 3 tablespoons of the olive oil, and salt and pepper to taste. Roast potatoes, uncovered, for 25 to 30 minutes or until they can easily be pierced with a fork. Let cool.
2. Meanwhile, for caramelize onions, in a large skillet over medium heat cook and stir onion slices in the remaining 2 tablespoons olive oil and the butter about 15 minutes.
3. For vinaigrette, in a blender combine vinegar, sugar, about 1/2 cup of the roasted chiles, and the garlic. Cover and blend until well combined. With blender running, slowly add canola oil in a steady stream through hole in the top until vinaigrette is thickened. Season to taste with salt and pepper.
4. In a large bowl gently toss roasted potatoes, caramelized onions, and the remaining chopped chiles. Add 1 cup of the vinaigrette; gently toss to combine. Sprinkle salad with cilantro. Pass remaining vinaigrette.