long ago thee was a very good restaurant which we often went to. they had a hot vinegar bacon salad dressing that was exceptional. i just found the receipe for it and i think you will really like the results.

makes about 1 cup
5 pieces of bacon cut into 1/2" pieces
5
tbsp - extra virgin olive oil
1/4 cup balsamic vinegar
3 Tbsp minced shallot
3 garlic cloves minced
1 Tfsp light brown sugar
pinch of salt & pepper

cook the bacon in a skillet until crisp
transfer the bacon to a paper towel and drain off all but about 3 Tbsp of the drippings
wisk the oil into the skillet
mix the vinegar, shallot, garlic and brown sugar in a small bowl, then add to the skillet, add the bacon bits and stir over a low heat. serve warm over cold lettuce