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Preheat oven to 275°. Grease and flour a 9 x 13 pan or two 9 x 2 inch pans for a double layer cake.
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In a small bowl, mix mashed banana with the lemon juice; set aside. In a medium bowl, mix flour, baking soda and salt; set aside.
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In a large bowl, cream 3/4 cup butter and 2 1/8 cups sugar until light and fluffy. Beat in eggs, one at a time, then stir in 2 tsp vanilla.
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Beat in the flour mixture alternately with the buttermilk in three batches beginning and ending with flour. Stir in banana mixture.
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Pour batter into prepared pan and bake in preheated oven for one hour or until toothpick inserted in center comes out clean.
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Remove from oven and let the cake cool for around 10 min before removing and placing it on the cooling rack.