Sprinkle Grated Gruyere And Parmasan Cheeses Onto Bread Slices Pass Under Boiler, Until Bread Is Toasted And Cheese Melts Remove From Oven And Set Aside Heat Butter And Oil In A Stockpot, Over A Medium-Low Flame Add Onions, Heat And Stir For 30-40 Minutes, Until A Dark Gold-Not Brown Stir In Flour, Heat And Stir For 2 Minutes To Color Further Slowly Stir In 1 Cup Of Broth To Blend With Flour Add Remaining Broth, Water, And Wine-Mix Well Bring To A Boil, Reduce Heat, Cover, And Simmer For 30 Minutes Season To Taste With Salt And Pepper Place Toasted Bread Into Individual Bowls Ladle Soup Over Bread Serve Immediately