Presoak Peas, If Necessary, According To Package Directions. Drain Well, If Presoaked. In A Large Pot, Add Water Or Stock, Whole Onion, Carrot, Turnip Or Parsnip, Marjoram, Thyme, And Salt. Cook Until Peas And Vegetables Are Tender, About 1 1/2 To 2 Hours. Drain Well. Mash Peas And Vegetables In Blender Or Press Through A Sieve. In A Small Frying Pan, Saute The Minced Onion In Butter Until Lightly Browned; Blend In Flour And Cook About 2 Minutes. Add To Blended Peas And Vegetables. Beat Until Fluffy And Serve Hot.