-
Preheat oven to 325°F
-
Place 1 c sugar in a deep, dry, non-stick pan. Heat slowly until it melts and turns medium-brown. Add the boiling water (stand back in case it boils up) and stir until smooth. Let cool to warm room temperature.
-
In a large mixing bowl, sift together flour, 1 1/2 c sugar, baking powder and salt. Make a well in the center of the dry ingredients. Add caramel, oil, egg yolks, cold water and vanilla. Beat with wooden spoon until smooth.
-
In a very clean dry bowl, beat egg whites with cream of tartar until very stiff peaks form. Fold egg whites into batter. Pour into an ungreased 9" or 10" tube pan.
-
Bake in preheated oven 65-70 minutes. Cool in pan 20 minutes, then remove to a rack until completely cool. Serve with caramel sauce on the side, if desired.