Okay stay with me here this can get a little complicated. Using the ingredient changes noted, on the side, prepare as follows.:
1- Combine beet puree, buttermilk, vinegar, lemon juice and vanilla in food processor, until smooth.
2- Beat together, until fluffy, shortening and butter. Then add eggs, one at a time.
3- Sift dry ingredients together.
4- Alternating with beet mixture, fold flour mixture into butter mixture until all ingredients are well blended.
5- Pour into prepared pans, as above, and bake at 350° for 20 minutes, until tester comes out, almost, clean.