This curious, delicious, yet gutsy soup is one of the best things to have come from Provence. It is of such importance to the French kitchen and way of life that prospective mothers-in-law will query, question and interrogate their beloved son's intended as to her ability to make this soup before they will countenance giving their approval to the alliance. Stout men in bars will recount exuberantly to you the magnificence of the Soupe au Pistou that they had for lunch yesterday, or h