Pre-heat oven to 350 degrees
Grease 2 8 in pans and line with parchment paper
Mash the bananas on a plate and cover with lemon juice, stir and then set aside
3 very ripe bananas, 1½ tsp lemon juice
In a bowl, sift flour, salt and baking soda, set aside
2¼ cups (270 g) all purpose flour, ½ tsp salt, 1½ tsp baking soda
In mixing bowl, combine butter, oil, and sugar and mix with hand mixer until mixed thoroughly
6 tbsp (84 g) unsalted butter, 3 tbsp (40.8 g) vegetable oil, 1½ cups (300 g) granulated sugar
Add eggs and vanilla extract and mix until combined
2 large eggs, 2 tsp vanilla extract
Add buttermilk and mix well. Scrape edges of bowl with spatula and continue mixing until combined
1 cup (240 g) buttermilk
Slowly add the flour, baking soda and salt and mix on low speed until just combined.
Add mashed bananas and mix until just combined
Divide batter into prepared pans
Bake for 30-40 minutes or until toothpick inserted comes out clean
Once baked, immediate place pans in freezer for 50 minutes
Remove from freezer and assemble, or wrap and place in refrigerator until ready to assemble