Saute The Onion And Garlic In 3 Tbs Of Oilin A Large, Heavy Saucepan 2 To 3 Minutes Over Moderate Heat Until They Begin To Color And Turn Glassy; Do Not Brown Or They Will Turn Bitter. Add The Potatoes And Saute, Stirring Constantly, 2 To 3 Minutes, Until They Begin To Color Also. Add The Water, Cover, And Boil Gently Over Moderate Heat 20 To 25 Minutes Until The Potatoes Are Mushy. Meanwhile, Fry The Sausage In A Medium Heavy Skillet Over Low Heat 10-12 Minutes Until Most Of The Fat Has Cooked Out; Drain Well And Reserve. When The Potatoes Are Soft, Remove The Pan From The Stove And With A Potato Masher, Mash The Potatoes Right In The Pan In The Soup Mixture. Add The Sausage, Salt, Pepper, Return To Moderate Heat, Cover And Simmer 5 Minutes. Add The Kale And Simmer Uncovered 5 Minutes Until Tender And The Color Of Jade. Mix In The Remaining Tablespoon Of Oil And Taste The Soup For Salt And Pepper.