Have you tried Banana Smoothie, so far? This is just very easy to make, if you have a blender. I used lacatan bananas, sugar, milk, vanilla, calamansi juice and ice. Others include yogurt in the recipe, but as we know, here in the Philippines it's costly. As a substitute, I used a few drops of calamansi juice because yogurt has rendered acid similar to lemon. The taste is the same. Fact is, acid prevents discoloration. The bananas when brushed with don't turn dark quickly.
Mine looks brown because I added vanilla. I like its essence to overpower the smell of the fruit. It turned out as desired.