Extra virgin olive oil • Leeks, white and light green parts only, halved lengthwise, thinly sliced, and washed (2 1/2 cups) • Red pepper flakes • Coarse salt and freshly ground pepper • Andouille or other smoked sausage, cut on the bias into 1/4" thick slices • Thyme • Chicken broth • Beans- cannellini, roman, and black eyed peas, drained and rinsed • Celery, plus leaves for garnish
