A delicious combination of peas, onions and lettuce which are gently poached in a buttery sauce with crème fraiche and vegetable stock; this classic French recipe is a wonderful way to serve tender little peas, petits pois. This recipe makes a delightful accompaniment to any type of main meal, and adds a real splash of colour. I have stated fresh OR frozen peas in the recipe - frozen peas can be used to great effect out of season. In the absence of small silverskin onions, spring onions (green onions) can be used, making this a very versatile recipe to serve throughout the year. Cut back on the butter if you are on a low fat diet - the taste will be less rich, but still as delicious!