Scrub, scrape and rinse the artichokes, using 1 teasp. of white vinegar or lemon juice in each water to keep the vegetable white. Put into sufficient boiling, salted water to cover the vegetable, adding 1 teasp. white vinegar or lemon juice to each quart of water. Simmer gently till just tender, about 20 min. Drain well and serve in a hot vegetable dish with the white sauce poured over.