How to Make It
In a bowl, whisk together the oil, vinegar and a pinch each of salt and pepper.
In a large skillet, cook the bacon over moderately high heat until browned and crisp, about 5 minutes. Add the shallot and cook, stirring, until softened, 1 to 2 minutes. Pour off all but 1 tablespoon of the fat from the skillet and stir in the vinaigrette, scraping up any browned bits from the bottom of the pan. Pour the hot dressing into a large bowl, add the frisée and toss well. Serve immediately.