Preheat oven to 350 degrees. Blend softened butter and olive oil. Add sugar, mixing well. Add eggs and beat thoroughly. Add sweet potato and mix well. In a separate bowl, sift together flour, baking soda and salt. Fold flour mixture, pecans and orange zest into wet ingredients. Pour into a pre-greased loaf pan. Bake for up to 1 hour or until the knife inserted comes out clean.
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