Heat 1 1/2 Cups Of Oil In A Saucepan, Add Onions And Salt. Saute Until Wilted. Allow Onions To Cool. Add Rice, Mint, Sugar, Pepper, Juice Of 1 Lemon And Salt. Mix Well. Rinse Grape Leaves. Add 1 Tablespoon Or More To The Grape Leaves. Fold Into Dolmades. Place In A Dutch Oven, Cover With Remaining Oil And Oil From Onion Filling. Cover With A Heavy Plate And Add Water To The Level Of The Plate. Bring To A Boil, Lower The Flame, And Simmer For 1 Hour. Sprinkle With Juice Of The Second Lemon. Serve.