Using at least a 4 qt. saucepan, add onion, fennel, carrots, parsley, butter and bacon to pan. (The photo is of a 4 quart pan with this recipe.) Cover pan and cook on medium heat until veggies are cooked down, for about 15 minutes. In the meantime, boil potatoes in a separate covered pan for about 10 minutes or until slightly tender. When potatoes are tender, drain and set aside.