4 oz mixed cooked beans
2 sticks celery
vegetable stock (or cooking water from beans)
1 Tsp tarragon
seasoning to taste
Puree the beans in a blender with the finely chopped celery. Tip into a saucepan and add enough stock to make the sauce the desired consistancy. Season to taste and add the herbs. heat through and add some soy suace if desired.