1Heat large saucepot with salted water to boiling. While water is coming to a boil, fill a large bowl or sink with ice water.
Once the water has come to a boil, add beans and cook for 4 minutes.
2Drain beans and place them in ice water.
3In the same pot or very large skillet (whichever works for you) add the olive oil and butter.
Add the pancetta to pan and cook until almost crispy.
Add the shallots and saute until tender. (the pancetta should be crispy by this time.)
4Drain the beans and add to the shallots and pancetta along with salt and pepper to taste. Cook until the beans are heated through, stirring occasionally.