boiling water with a slotted spoon and immediately plunge into a bowl of ice cold water to stop the cooking process. drain the beans once they’re cool and set aside.
add the bacon pieces to a skillet over medium heat. cook the bacon for 2 minutes, and then add the peppers, garlic and onions, and continue cooking until the bacon is done (but not crisp) and the onions are golden brown, 3 to 5 minutes. remove from the heat and set aside.
in a separate saucepan, melt the butter over medium heat. sprinkle the flour into the pan and whisk immediately to evenly mix it into the butter. cook for a minute 