Oil two 8 x 5-inch loaf pans.
Wash orange, cut into quarters and remove seeds (do not peel). Place in a food processor or blender and process until pureed. Add orange juice if necessary to measure 1 cup.
In a medium bowl, beat eggs until foamy. Add oil and beat 1 minute. Add orange Purée and stir to combine.
In another bowl, sift together the flour, 1 cup sugar, salt and baking powder. Add the dry ingredients alternately with the evaporated milk and vanilla extract to the egg mixture beginning and ending with dry ingredients, mixing well.
Preheat oven to 400° F.
Divide batter evenly between prepared pans. Let batter rest for 20 minutes. Sprinkle 1 tablespoon sugar over each loaf.
Bake 20 minutes. Score the top of each loaf lengthwise with a sharp knife. Reduce heat to 300° F and bake another 40 minutes. Bread is done when a cake tester inserted in the center of the bread comes out clean. Let bread rest 20 minutes before turning out of pans.
NOTE: This batter can be divided among 5 mini bread pans and baked for 20 minutes at 400 degrees. Reduce heat to 300° F and score top. Bake another 20 minutes or until bread tests done.Makes 4 Source: