The foundation of this exceptional dessert lies in a carefully selected blend of plant-based ingredients. Essential components include grape seed oil, all-purpose flour, vegan butter, and refined sugar, contributing to the cake's structure and sweetness. Unsweetened apple sauce and vanilla extract introduce natural moisture and aromatic notes. Baking powder and sea salt are crucial for leavening and flavor balance. The liquid base consists of plain soy milk and distilled white vinegar, creating a vegan buttermilk substitute that ensures a tender crumb. For the signature upside-down topping, vegan brown sugar, fresh or canned pineapple slices, and pecans are artfully arranged.
The journey to this delectable cake begins with preheating the oven to 350 degrees Fahrenheit. Prepare two round cake pans by coating them with grape seed oil and a dusting of flour. Evenly distribute the vegan brown sugar across the pan bottoms, followed by melted vegan butter. Arrange a pineapple slice at the center of each pan, encircled by additional slices, with a pecan nestled within each. In a small bowl, combine soy milk and distilled white vinegar, then set aside to curdle. Cream the vegan butter and refined sugar until fluffy, then incorporate apple sauce and vanilla. Whisk together the dry ingredients—flour, baking powder, and sea salt—in a separate bowl. Gradually add the dry mixture to the wet ingredients, alternating with the curdled soy milk, mixing until just combined. A final stir of distilled white vinegar into the batter enhances its texture. Pour the batter over the prepared pineapple layers, ensuring even distribution between the two pans. Bake for approximately 40 minutes, or until a toothpick inserted into the center emerges clean. Allow the cakes to cool in their pans for 10 minutes before inverting them onto a wire rack to cool completely. Once cooled, carefully stack one cake atop the other to form a magnificent double-layered creation.